quartz: Return properly when input is flushing or reaching end of stream.

dlls/quartz/videorenderer.c

diff --git a/dlls/quartz/videorenderer.c b/dlls/quartz/videorenderer.c
index acd0ba2..437779c 100644
--- a/dlls/quartz/videorenderer.c
+++ b/dlls/quartz/videorenderer.c
@@ -355,9 +355,14 @@
     long cbSrcStream = 0;
     REFERENCE_TIME tStart, tStop;
     HRESULT hr;
+
     EnterCriticalSection(&This->csFilter);
+
     if (This->pInputPin->flushing || This->pInputPin->end_of_stream)
-        hr = S_FALSE;
+    {
+        LeaveCriticalSection(&This->csFilter);
+        return S_FALSE;
+    }
 
     if (This->state == State_Stopped)
     {