accel: fix unused parameter warning

Change-Id: Iacf37f3b6fc7016b3225066e164046b3db45c138

src/media/video/accel.cpp

@@ -52,7 +52,7 @@ getFormatCb(AVCodecContext* codecCtx, const AVPixelFormat* formats)
 }
 
 int
-transferFrameData(HardwareAccel accel, AVCodecContext* codecCtx, VideoFrame& frame)
+transferFrameData(HardwareAccel accel, AVCodecContext* /*codecCtx*/, VideoFrame& frame)
 {
     if (accel.name.empty())
         return -1;