isc_loopmgr_pause was called inappropriately

isc_loopmgr_pause can't be called before isc_loopmgr_run is
called as the thread ids are not yet valid.  If there is a
fatal error before isc_loopmgr_run is run then don't call
isc_loopmgr_pause.

bin/named/main.c

@@ -1506,6 +1506,10 @@ main(int argc, char *argv[]) {
 	 */
 	isc_signal_start(named_g_server->sighup);
 
+	/*
+	 * Pause the loop manager in fatal.
+	 */
+	named_g_loopmgr_running = true;
 	isc_loopmgr_run(named_g_loopmgr);
 
 #ifdef HAVE_LIBSCF