avformat/vobsub: remove pointless FAIL macro.

libavformat/mpeg.c

@@ -828,8 +828,6 @@ end:
     return ret;
 }
 
-#define FAIL(r) do { ret = r; goto fail; } while (0)
-
 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MpegDemuxContext *vobsub = s->priv_data;
@@ -878,7 +876,7 @@ static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
         if (ret < 0) {
             if (pkt->size) // raise packet even if incomplete
                 break;
-            FAIL(ret);
+            goto fail;
         }
         to_read = ret & 0xffff;
         new_pos = avio_tell(pb);
@@ -895,7 +893,7 @@ static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
 
         ret = av_grow_packet(pkt, to_read);
         if (ret < 0)
-            FAIL(ret);
+            goto fail;
 
         n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
         if (n < to_read)