Fix end time of last chapter in compute_chapters_end

Parenthesis are misplaced in calculation of max_time.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavformat/utils.c

@@ -2110,7 +2110,7 @@ enum CodecID av_codec_get_id(const AVCodecTag * const *tags, unsigned int tag)
 static void compute_chapters_end(AVFormatContext *s)
 {
     unsigned int i, j;
-    int64_t max_time = s->duration + (s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time;
+    int64_t max_time = s->duration + ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time);
 
     for (i = 0; i < s->nb_chapters; i++)
         if (s->chapters[i]->end == AV_NOPTS_VALUE) {