Merge commit '6bdae41d'

* commit '6bdae41d':
  matroskadec: Check memory allocations

Conflicts:
	libavformat/matroskadec.c

See: 3e2a5b33Merged-by: NMichael Niedermayer <michaelni@gmx.at>

libavformat/matroskadec.c

@@ -2648,8 +2648,11 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
         offset = 8;
 
     pkt = av_mallocz(sizeof(AVPacket));
-    if (!pkt)
+    if (!pkt) {
+        if (pkt_data != data)
+            av_freep(&pkt_data);
         return AVERROR(ENOMEM);
+    }
     /* XXX: prevent data copy... */
     if (av_new_packet(pkt, pkt_size + offset) < 0) {
         av_free(pkt);