firewall: prevent duplicate values in interface state vars

SVN-Revision: 26382

package/firewall/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=firewall
 
 PKG_VERSION:=2
-PKG_RELEASE:=23
+PKG_RELEASE:=24
 
 include $(INCLUDE_DIR)/package.mk
 

package/firewall/files/lib/core_interface.sh

@@ -5,6 +5,9 @@ fw__uci_state_add() {
 	local item="$2"
 
 	local val=" $(uci_get_state firewall core $var) "
+	val="${val// $item / }"
+	val="${val# }"
+	val="${val% }"
 	uci_set_state firewall core $var "${val:+$val }$item"
 }