revert r4802 (try with auto_guess if first detection fails)

this change is broken, 3/4 of the code added is unreachable, ill implement
it correctly in a moment

Originally committed as revision 9174 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpegts.c

@@ -1221,7 +1221,6 @@ static int mpegts_read_header(AVFormatContext *s,
     ts->stream = s;
     ts->auto_guess = 0;
 
-goto_auto_guess:
     if (s->iformat == &mpegts_demuxer) {
         /* normal demux */
 
@@ -1274,15 +1273,8 @@ goto_auto_guess:
             }
             /* if could not find service, exit */
 
-            if (ts->set_service_ret != 0) {
-                if(ts->auto_guess)
-                  return -1;
-                else {
-                  //let's retry with auto_guess set
-                 ts->auto_guess = 1;
-                 goto goto_auto_guess;
-                }
-            }
+            if (ts->set_service_ret != 0)
+                return -1;
 
 #ifdef DEBUG_SI
             av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");