renderer&guest_gpu: minor cleanup

src/kernel/memory.cpp

@@ -869,7 +869,7 @@ bool TryReadBacking(uint64_t vaddr, void* data, uint64_t size) {
 
 bool TryReadGpuCleanBacking(uint64_t vaddr, void* data, uint64_t size) {
 	if (g_gpu_resources != nullptr && IsGpuAddressRange(vaddr, size)) {
-		if (!Graphics::Gpu::IsGpuThread() ||
+		if (!Graphics::GuestGpu::IsGpuThread() ||
 		    GetGpuResources().GetBufferCache().HasGpuDirtyBytes(vaddr, size) ||
 		    GetGpuResources().GetTextureCache().QueryRegion(vaddr, size).gpu_image_bytes) {
 			return false;