avformat/hls: Pass a copy of the URL for probing

The segments / url can be modified by the io read when reloading

This may be an alternative or additional fix for Ticket8673
as a further alternative the reload stuff could be disabled during
probing
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b5e39880fb7269b1b3577cee288e06aa3dc1dfa2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/hls.c

@@ -1932,6 +1932,7 @@ static int hls_read_header(AVFormatContext *s)
     /* Open the demuxer for each playlist */
     for (i = 0; i < c->n_playlists; i++) {
         struct playlist *pls = c->playlists[i];
+        char *url;
         ff_const59 AVInputFormat *in_fmt = NULL;
 
         if (!(pls->ctx = avformat_alloc_context())) {
@@ -1969,8 +1970,9 @@ static int hls_read_header(AVFormatContext *s)
                           read_data, NULL, NULL);
         pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
         pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
-        ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
-                                    NULL, 0, 0);
+        url = av_strdup(pls->segments[0]->url);
+        ret = av_probe_input_buffer(&pls->pb, &in_fmt, url, NULL, 0, 0);
+        av_free(url);
         if (ret < 0) {
             /* Free the ctx - it isn't initialized properly at this point,
              * so avformat_close_input shouldn't be called. If