Commit afc8d78a18 for freeswitch.com

commit afc8d78a1899ce02650a70d0f18192d5028466c7
Author: Tomasz Ostrowski <43222462+tomek-o@users.noreply.github.com>
Date:   Tue Mar 28 16:36:01 2023 +0200

    [mod_enum] Fix use-after-free if creating resolver from file failed

diff --git a/src/mod/applications/mod_enum/mod_enum.c b/src/mod/applications/mod_enum/mod_enum.c
index 2908a1eb1e..aa87f24826 100644
--- a/src/mod/applications/mod_enum/mod_enum.c
+++ b/src/mod/applications/mod_enum/mod_enum.c
@@ -497,6 +497,7 @@ switch_status_t ldns_lookup(const char *number, const char *root, char *server_n
 		/* create a new resolver from /etc/resolv.conf */
 		if (res) {
 			ldns_resolver_free(res);
+			res = NULL;
 		}
 		s = ldns_resolver_new_frm_file(&res, NULL);
 	}