mpegts: log into an AVFormatContext rather than MpegTSContext.

MpegTSContext's AVClass member can be NULL.

libavformat/mpegts.c

@@ -628,7 +628,7 @@ static void new_pes_packet(PESContext *pes, AVPacket *pkt)
 
     if(pes->total_size != MAX_PES_PAYLOAD &&
        pes->pes_header_size + pes->data_index != pes->total_size + 6) {
-        av_log(pes->ts, AV_LOG_WARNING, "PES packet size mismatch\n");
+        av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
         pes->flags |= AV_PKT_FLAG_CORRUPT;
     }
     memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
@@ -1293,7 +1293,7 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
 
     tss->last_cc = cc;
     if (!cc_ok) {
-        av_log(ts, AV_LOG_WARNING, "Continuity Check Failed\n");
+        av_log(ts->stream, AV_LOG_WARNING, "Continuity Check Failed\n");
         if(tss->type == MPEGTS_PES) {
             PESContext *pc = tss->u.pes_filter.opaque;
             pc->flags |= AV_PKT_FLAG_CORRUPT;