remove useless if()

Originally committed as revision 8428 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/utils.c

@@ -632,7 +632,7 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
         st->last_IP_pts= pkt->pts;
         /* cannot compute PTS if not present (we can compute it only
            by knowing the futur */
-    } else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
+    } else {
         if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
             int64_t old_diff= FFABS(st->cur_dts - pkt->duration - pkt->pts);
             int64_t new_diff= FFABS(st->cur_dts - pkt->pts);