Return CRITICAL if hostname invalid, as per guidelines

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1335 f882894a-f735-0410-b71e-b25c423dba1c

plugins/check_tcp.c

@@ -549,7 +549,7 @@ process_arguments (int argc, char **argv)
 	if (server_address == NULL)
 		usage4 (_("You must provide a server address"));
 	else if (server_address[0] != '/' && is_host (server_address) == FALSE)
-		usage2 (_("Invalid hostname, address, or socket"), server_address);
+		die (STATE_CRITICAL, "%s: %s - %s\n", progname, _("Invalid hostname, address or socket"), server_address);
 
 	return TRUE;
 }