Fixed a typo in the WMF backend which caused a compilation failure

Reviewed-by: trustme
(cherry picked from commit 7eab979c41513321518d5e3cea6d142bbf4e58d9)

Change-Id: I9cd5de907867ea6561c568d10c88e3bf5a701509
Reviewed-on: http://codereview.qt-project.org/5496
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/wmf/player/mfvideorenderercontrol.cpp

@@ -1382,8 +1382,7 @@ namespace
                 }
             } else {
                 bool requestSample = true;
-                // If the plugins/multimedia/wmf/player/mfstream.cpp
-time stamp is too early, just discard this sample.
+                // If the time stamp is too early, just discard this sample.
                 if (SUCCEEDED(hr) && time >= m_startTime) {
                     IMFMediaBuffer *pBuffer = NULL;
                     hr = pSample->ConvertToContiguousBuffer(&pBuffer);