avformat/rtsp: Fix unchecked return value

Reviewed-by: Thomas Volkert <silvo@gmx.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtsp.c

@@ -174,11 +174,15 @@ static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
     *end = AV_NOPTS_VALUE;
 
     get_word_sep(buf, sizeof(buf), "-", &p);
-    av_parse_time(start, buf, 1);
+    if (av_parse_time(start, buf, 1) < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Invalid interval start specification '%s'\n", buf);
+        return;
+    }
     if (*p == '-') {
         p++;
         get_word_sep(buf, sizeof(buf), "-", &p);
-        av_parse_time(end, buf, 1);
+        if (av_parse_time(end, buf, 1) < 0)
+            av_log(NULL, AV_LOG_ERROR, "Invalid interval end specification '%s'\n", buf);
     }
 }