one more leak

src/Refresh_Driver_Vulkan.c

@@ -3243,6 +3243,7 @@ static void VULKAN_INTERNAL_DestroyUniformBufferPool(
 	for (i = 0; i < uniformBufferPool->availableBufferCount; i += 1)
 	{
 		VULKAN_INTERNAL_DestroyBuffer(renderer, uniformBufferPool->availableBuffers[i]->vulkanBuffer);
+		SDL_free(uniformBufferPool->availableBuffers[i]);
 	}
 
 	SDL_DestroyMutex(uniformBufferPool->lock);