Bug 1767467 - Fix hardware H264 decoding support detection on Windows. r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D145383

dom/media/platforms/wmf/DXVA2Manager.cpp

@@ -722,10 +722,11 @@ bool D3D11DXVA2Manager::SupportsConfig(const VideoInfo& aInfo,
                     DXVA2_Intel_ClearVideo_ModeH264_VLD_NoFGT};
     for (const GUID& guid : guids) {
       BOOL supported = false;
-      hr = videoDevice->CheckVideoDecoderFormat(&DXVA2_ModeH264_VLD_NoFGT,
-                                                DXGI_FORMAT_NV12, &supported);
+      hr = videoDevice->CheckVideoDecoderFormat(&guid, DXGI_FORMAT_NV12,
+                                                &supported);
       if (SUCCEEDED(hr) && supported) {
         desc.Guid = guid;
+        break;
       }
     }
   } else if (subtype == MFVideoFormat_VP80) {