avcodec/qsv_internal: Fix project name

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/qsv_internal.h

@@ -40,7 +40,7 @@ typedef struct QSVFrame {
 } QSVFrame;
 
 /**
- * Convert a libmfx error code into a libav error code.
+ * Convert a libmfx error code into a ffmpeg error code.
  */
 int ff_qsv_error(int mfx_err);