GPU: Don't pass null properties to SDL_CopyProperties()

(cherry picked from commit 300013cea7)

src/gpu/d3d12/SDL_gpu_d3d12.c

@@ -3483,7 +3483,9 @@ static SDL_GPUTexture *D3D12_CreateTexture(
     // Copy properties so we don't lose information when the client destroys them
     container->header.info = *createinfo;
     container->header.info.props = SDL_CreateProperties();
+    if (createinfo->props) {
         SDL_CopyProperties(createinfo->props, container->header.info.props);
+    }
 
     container->textureCapacity = 1;
     container->textureCount = 1;

src/gpu/metal/SDL_gpu_metal.m

@@ -1494,7 +1494,9 @@ static SDL_GPUTexture *METAL_CreateTexture(
         // Copy properties so we don't lose information when the client destroys them
         container->header.info = *createinfo;
         container->header.info.props = SDL_CreateProperties();
+        if (createinfo->props) {
             SDL_CopyProperties(createinfo->props, container->header.info.props);
+        }
 
         container->activeTexture = texture;
         container->textureCapacity = 1;

src/gpu/vulkan/SDL_gpu_vulkan.c

@@ -6775,7 +6775,9 @@ static SDL_GPUTexture *VULKAN_CreateTexture(
     // Copy properties so we don't lose information when the client destroys them
     container->header.info = *createinfo;
     container->header.info.props = SDL_CreateProperties();
+    if (createinfo->props) {
         SDL_CopyProperties(createinfo->props, container->header.info.props);
+    }
 
     container->canBeCycled = true;
     container->activeTexture = texture;