fix syntax error in preinit (#6575)

SVN-Revision: 19344

target/linux/brcm-2.4/base-files/lib/preinit/15_set_preinit_interface_brcm

@@ -4,7 +4,7 @@ port_net_echo() {
 	[ -n "$pi_ifname" ] && grep "$pi_ifname" /proc/net/dev >/dev/null && {
 		if [ "$pi_preinit_net_messages" = "y" ] || [ "$pi_failsafe_net_message" = "true" ] && [ "$pi_preinit_no_failsafe_netmsg" != "y" ]; then 
 			netmsg $pi_broadcast "$1"
-		}
+		fi
 	}
 }