Merge commit '98cab39798612dcaea4f9b6d1e7974bc60d84e13'

* commit '98cab39798612dcaea4f9b6d1e7974bc60d84e13':
  lavf: Fix variables constness in ff_iso8601_to_unix_time()

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/utils.c

@@ -4086,7 +4086,7 @@ int ff_find_stream_index(AVFormatContext *s, int id)
 int64_t ff_iso8601_to_unix_time(const char *datestr)
 {
     struct tm time1 = { 0 }, time2 = { 0 };
-    char *ret1, *ret2;
+    const char *ret1, *ret2;
     ret1 = av_small_strptime(datestr, "%Y - %m - %d %T", &time1);
     ret2 = av_small_strptime(datestr, "%Y - %m - %dT%T", &time2);
     if (ret2 && !ret1)