Merge commit 'f261e508'

* commit 'f261e508':
  dca: Error out on missing DSYNC
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/dcadec.c

@@ -1422,6 +1422,7 @@ static int dca_subsubframe(DCAContext *s, int base_channel, int block_index)
 #endif
         } else {
             av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");
+            return AVERROR_INVALIDDATA;
         }
     }