Fix compilation with -DDEBUG, patch by Albert Astals Cid, aastals tv-wan es.

Originally committed as revision 13727 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/ffmdec.c

@@ -364,7 +364,7 @@ static int ffm_read_packet(AVFormatContext *s, AVPacket *pkt)
             return AVERROR(EAGAIN);
         }
         dprintf(s, "pos=%08"PRIx64" spos=%"PRIx64", write_index=%"PRIx64" size=%"PRIx64"\n",
-               url_ftell(s->pb), s->pb.pos, ffm->write_index, ffm->file_size);
+               url_ftell(s->pb), s->pb->pos, ffm->write_index, ffm->file_size);
         if (ffm_read_data(s, ffm->header, FRAME_HEADER_SIZE, 1) !=
             FRAME_HEADER_SIZE)
             return AVERROR(EAGAIN);