Fix typo in comment.

I was looking for a memory leak when I have a lot of
"ts demux warning: discontinuity received 'x' instead of 'y' (pid='xxx')"
messages.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/demux/ts.c

@@ -1990,7 +1990,7 @@ static bool GatherPES( demux_t *p_demux, ts_pid_t *pid, block_t *p_bk )
             pid->i_cc = i_cc;
             if( pid->es->p_pes && pid->es->fmt.i_cat != VIDEO_ES )
             {
-                /* Small video artifacts are usually better then
+                /* Small video artifacts are usually better than
                  * dropping full frames */
                 pid->es->p_pes->i_flags |= BLOCK_FLAG_CORRUPTED;
             }