mpegts: Fix typo in handling sections in the PMT.

This was an error rebasing 4682a1dc3a for
commit. The "pes" variable guaranteed to be NULL in that block.

libavformat/mpegts.c

@@ -1460,7 +1460,7 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
             if (idx >= 0) {
                 st = ts->stream->streams[idx];
             } else {
-                st = avformat_new_stream(pes->stream, NULL);
+                st = avformat_new_stream(ts->stream, NULL);
                 st->id = pid;
                 st->codec->codec_type = AVMEDIA_TYPE_DATA;
             }