MT#55283 fix incorrect substituted RPC URL

The `created_from` address string includes the port, which must be
removed when substituting it for the RPC URL.

Fix-up for Ib67b57b1d

Change-Id: Iaa33ec660d21736f8b075f36479ba2734a480a4a
(cherry picked from commit db1307d)

Author: rfuchs

daemon/call.c

@@ -482,8 +482,12 @@ void kill_calls_timer(GSList *list, const char *url) {
 			str cb_addr;
 			if (ca->xmlrpc_callback.len)
 				cb_addr = ca->xmlrpc_callback;
-			else
+			else {
 				cb_addr = ca->created_from;
+				char *colon = memrchr(cb_addr.s, ':', cb_addr.len);
+				if (colon)
+					cb_addr.len = (colon - cb_addr.s);
+			}
 
 			snprintf(url_buf, sizeof(url_buf), "%s" STR_FORMAT "%s",
 					url_prefix, STR_FMT(&cb_addr),