Fix EXE_BAD_ACCESS caused by optional argument

This argument is now non optional, but this never hits the same bad access.
I voted to simplify the code here since the argument is never used optionally in our codebase.

drivers/gles3/rasterizer_scene_gles3.cpp

@@ -1189,8 +1189,8 @@ void RasterizerSceneGLES3::_fill_render_list(RenderListType p_render_list, const
 					distance = 1.0;
 				}
 
-				uint32_t indices;
-				surf->lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->lod_distance_multiplier, p_render_data->screen_mesh_lod_threshold, &indices);
+				uint32_t indices = 0;
+				surf->lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->lod_distance_multiplier, p_render_data->screen_mesh_lod_threshold, indices);
 				/*
 				if (p_render_data->render_info) {
 					indices = _indices_to_primitives(surf->primitive, indices);

drivers/gles3/storage/mesh_storage.h

@@ -325,13 +325,12 @@ public:
 		return s->index_count ? s->index_count : s->vertex_count;
 	}
 
-	_FORCE_INLINE_ uint32_t mesh_surface_get_lod(void *p_surface, float p_model_scale, float p_distance_threshold, float p_mesh_lod_threshold, uint32_t *r_index_count = nullptr) const {
+	_FORCE_INLINE_ uint32_t mesh_surface_get_lod(void *p_surface, float p_model_scale, float p_distance_threshold, float p_mesh_lod_threshold, uint32_t &r_index_count) const {
 		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
 
 		int32_t current_lod = -1;
-		if (r_index_count) {
-			*r_index_count = s->index_count;
-		}
+		r_index_count = s->index_count;
+
 		for (uint32_t i = 0; i < s->lod_count; i++) {
 			float screen_size = s->lods[i].edge_length * p_model_scale / p_distance_threshold;
 			if (screen_size > p_mesh_lod_threshold) {
@@ -342,9 +341,7 @@ public:
 		if (current_lod == -1) {
 			return 0;
 		} else {
-			if (r_index_count) {
-				*r_index_count = s->lods[current_lod].index_count;
-			}
+			r_index_count = s->lods[current_lod].index_count;
 			return current_lod + 1;
 		}
 	}

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -963,8 +963,8 @@ void RenderForwardClustered::_fill_render_list(RenderListType p_render_list, con
 					distance = 1.0;
 				}
 
-				uint32_t indices;
-				surf->sort.lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->scene_data->lod_distance_multiplier, p_render_data->scene_data->screen_mesh_lod_threshold, &indices);
+				uint32_t indices = 0;
+				surf->sort.lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->scene_data->lod_distance_multiplier, p_render_data->scene_data->screen_mesh_lod_threshold, indices);
 				if (p_render_data->render_info) {
 					indices = _indices_to_primitives(surf->primitive, indices);
 					if (p_render_list == RENDER_LIST_OPAQUE) { //opaque

servers/rendering/renderer_rd/forward_mobile/render_forward_mobile.cpp

@@ -1830,8 +1830,8 @@ void RenderForwardMobile::_fill_render_list(RenderListType p_render_list, const
 					distance = 1.0;
 				}
 
-				uint32_t indices;
-				surf->lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->scene_data->lod_distance_multiplier, p_render_data->scene_data->screen_mesh_lod_threshold, &indices);
+				uint32_t indices = 0;
+				surf->lod_index = mesh_storage->mesh_surface_get_lod(surf->surface, inst->lod_model_scale * inst->lod_bias, distance * p_render_data->scene_data->lod_distance_multiplier, p_render_data->scene_data->screen_mesh_lod_threshold, indices);
 				if (p_render_data->render_info) {
 					indices = _indices_to_primitives(surf->primitive, indices);
 					if (p_render_list == RENDER_LIST_OPAQUE) { //opaque

servers/rendering/renderer_rd/storage_rd/mesh_storage.h

@@ -398,13 +398,11 @@ public:
 		return s->index_count ? s->index_count : s->vertex_count;
 	}
 
-	_FORCE_INLINE_ uint32_t mesh_surface_get_lod(void *p_surface, float p_model_scale, float p_distance_threshold, float p_mesh_lod_threshold, uint32_t *r_index_count = nullptr) const {
+	_FORCE_INLINE_ uint32_t mesh_surface_get_lod(void *p_surface, float p_model_scale, float p_distance_threshold, float p_mesh_lod_threshold, uint32_t &r_index_count) const {
 		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
 
 		int32_t current_lod = -1;
-		if (r_index_count) {
-			*r_index_count = s->index_count;
-		}
+		r_index_count = s->index_count;
 		for (uint32_t i = 0; i < s->lod_count; i++) {
 			float screen_size = s->lods[i].edge_length * p_model_scale / p_distance_threshold;
 			if (screen_size > p_mesh_lod_threshold) {
@@ -415,9 +413,7 @@ public:
 		if (current_lod == -1) {
 			return 0;
 		} else {
-			if (r_index_count) {
-				*r_index_count = s->lods[current_lod].index_count;
-			}
+			r_index_count = s->lods[current_lod].index_count;
 			return current_lod + 1;
 		}
 	}