Update SDL_GpuDevice to SDL_GPUDevice

src/gpu/metal/SDL_gpu_metal.m

@@ -3759,7 +3759,7 @@ static void METAL_ReleaseWindow(
         MetalWindowData *windowData = METAL_INTERNAL_FetchWindowData(window);
 
         if (windowData == NULL) {
-            SET_STRING_ERROR_AND_RETURN("Window is not claimed by this SDL_GpuDevice", );
+            SET_STRING_ERROR_AND_RETURN("Window is not claimed by this SDL_GPUDevice", );
         }
 
         METAL_Wait(driverData);
@@ -3838,7 +3838,7 @@ static bool METAL_INTERNAL_AcquireSwapchainTexture(
 
         windowData = METAL_INTERNAL_FetchWindowData(window);
         if (windowData == NULL) {
-            SET_STRING_ERROR_AND_RETURN("Window is not claimed by this SDL_GpuDevice", false);
+            SET_STRING_ERROR_AND_RETURN("Window is not claimed by this SDL_GPUDevice", false);
         }
 
         // Update the window size