mpegtsdemux: fix playback if PMT is seen before PAT

The stream for the PMT pid has to be cleared since the version checking
in the packetizer won't emit the same PMT again otherwise.

gst/mpegtsdemux/mpegtsbase.c

@@ -697,6 +697,8 @@ mpegts_base_apply_pmt (MpegTSBase * base,
 
   if (G_UNLIKELY (base->first_pat_offset == -1)) {
     GST_WARNING ("Got pmt without pat first. Returning");
+    /* remove the stream since we won't get another PMT otherwise */
+    mpegts_packetizer_remove_stream (base->packetizer, pmt_pid);
     return;
   }