quartz: Remove variable keyframe which is not really used from AVISplitter_next_request.

dlls/quartz/avisplit.c

@@ -206,7 +206,6 @@ static HRESULT AVISplitter_next_request(AVISplitterImpl *This, DWORD streamnumbe
         {
             DWORD flags = This->oldindex->aIndex[stream->pos].dwFlags;
             DWORD size = This->oldindex->aIndex[stream->pos].dwSize;
-            BOOL keyframe;
 
             /* End of file */
             if (stream->index)
@@ -216,8 +215,6 @@ static HRESULT AVISplitter_next_request(AVISplitterImpl *This, DWORD streamnumbe
                 return S_FALSE;
             }
 
-            keyframe = !!(flags & AVIIF_KEYFRAME);
-
             rtSampleStart = MEDIATIME_FROM_BYTES(This->offset);
             rtSampleStart += MEDIATIME_FROM_BYTES(This->oldindex->aIndex[stream->pos].dwOffset);
             rtSampleStop = rtSampleStart + MEDIATIME_FROM_BYTES(size);