mesh_surface_get_format_offset and mesh_surface_get_format_stride will now provide an error with an invalid array index

(cherry picked from commit 8e57aae57dd997959d17178ed452350cd4bf03bf)

servers/visual_server.cpp

@@ -843,6 +843,7 @@ Error VisualServer::_surface_set_data(Array p_arrays, uint32_t p_format, uint32_
 }
 
 uint32_t VisualServer::mesh_surface_get_format_offset(uint32_t p_format, int p_vertex_len, int p_index_len, int p_array_index) const {
+	ERR_FAIL_INDEX_V(p_array_index, ARRAY_MAX, 0);
 	uint32_t offsets[ARRAY_MAX];
 	uint32_t strides[ARRAY_MAX];
 	mesh_surface_make_offsets_from_format(p_format, p_vertex_len, p_index_len, offsets, strides);
@@ -850,6 +851,7 @@ uint32_t VisualServer::mesh_surface_get_format_offset(uint32_t p_format, int p_v
 }
 
 uint32_t VisualServer::mesh_surface_get_format_stride(uint32_t p_format, int p_vertex_len, int p_index_len, int p_array_index) const {
+	ERR_FAIL_INDEX_V(p_array_index, ARRAY_MAX, 0);
 	uint32_t offsets[ARRAY_MAX];
 	uint32_t strides[ARRAY_MAX];
 	mesh_surface_make_offsets_from_format(p_format, p_vertex_len, p_index_len, offsets, strides);