CID:1087631 In the unlikely case the sprintf fails, free the memory instead of leak it

src/switch_xml.c

@@ -2043,6 +2043,8 @@ static void switch_xml_user_cache(const char *key, const char *user_name, const
 		char *expires_val = malloc(1024);
 		if (sprintf(expires_val, "%ld", (long)expires)) {
 			switch_core_hash_insert(CACHE_EXPIRES_HASH, mega_key, expires_val);
+		} else {
+			switch_safe_free(expires_val);
 		}
 	}
 	switch_core_hash_insert(CACHE_HASH, mega_key, switch_xml_dup(user));