rtspdec: Fix keep-alive request for ACTi cameras

Some ACTi cameras fail if "*" is passed as the URI.
Signed-off-by: Ismael Luceno <ismael.luceno@corp.bluecherry.net>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/rtspdec.c

@@ -877,7 +877,7 @@ retry:
                  rt->get_parameter_supported)) {
                 ff_rtsp_send_cmd_async(s, "GET_PARAMETER", rt->control_uri, NULL);
             } else {
-                ff_rtsp_send_cmd_async(s, "OPTIONS", "*", NULL);
+                ff_rtsp_send_cmd_async(s, "OPTIONS", rt->control_uri, NULL);
             }
             /* The stale flag should be reset when creating the auth response in
              * ff_rtsp_send_cmd_async, but reset it here just in case we never