Cleanup.

src/renderer_d3d12.cpp

@@ -2849,7 +2849,7 @@ data.NumQualityLevels = 0;
 	{
 		ID3D12Resource* staging = createCommittedResource(s_renderD3D12->m_device, HeapProperty::Upload, _size);
 		uint8_t* data;
-		DX_CHECK(staging->Map(0, nullptr, (void**)&data) );
+		DX_CHECK(staging->Map(0, NULL, (void**)&data) );
 		memcpy(data, _data, _size);
 		staging->Unmap(0, NULL);