qsv: Drop some unused variables

libavcodec/qsv.c

@@ -466,9 +466,7 @@ static mfxStatus qsv_frame_lock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
     QSVMid *qsv_mid = mid;
     AVHWFramesContext *hw_frames_ctx = (AVHWFramesContext*)qsv_mid->hw_frames_ref->data;
     AVQSVFramesContext *hw_frames_hwctx = hw_frames_ctx->hwctx;
-    int size;
     int ret;
-    mfxStatus err;
 
     if (qsv_mid->locked_frame)
         return MFX_ERR_UNDEFINED_BEHAVIOR;
@@ -523,7 +521,6 @@ fail:
 static mfxStatus qsv_frame_unlock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
 {
     QSVMid *qsv_mid = mid;
-    int ret;
 
     av_frame_free(&qsv_mid->locked_frame);
     av_frame_free(&qsv_mid->hw_frame);