check for malloc failure

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@15132 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/movenc.c

@@ -1616,6 +1616,8 @@ static int mov_write_packet(AVFormatContext *s, AVPacket *pkt)
         /* copy frame to create needed atoms */
         trk->vosLen = size;
         trk->vosData = av_malloc(size);
+        if (!trk->vosData)
+            return AVERROR(ENOMEM);
         memcpy(trk->vosData, pkt->data, size);
     }