odhcp6c: silence fw3 warnings

Signed-off-by: Steven Barth <steven@midlink.org>

SVN-Revision: 45867

package/network/ipv6/odhcp6c/files/dhcpv6.script

@@ -118,7 +118,7 @@ setup_interface () {
 		MAPRULE="$LW4O6"
 	fi
 
-	[ -n "$ZONE" ] || ZONE=$(fw3 -q network $INTERFACE)
+	[ -n "$ZONE" ] || ZONE=$(fw3 -q network $INTERFACE 2>/dev/null)
 
 	if [ "$IFACE_MAP" != 0 -a -n "$MAPTYPE" -a -n "$MAPRULE" ]; then
 		[ -z "$IFACE_MAP" -o "$IFACE_MAP" = 1 ] && IFACE_MAP=${INTERFACE}_4