firewall: update to latest git HEAD

aa8846b ubus: avoid dumping interface state with NULL message

Signed-off-by: Jo-Philipp Wich <[email protected]>

package/network/config/firewall/Makefile

@@ -13,9 +13,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/firewall3.git
-PKG_SOURCE_DATE:=2018-07-17
-PKG_SOURCE_VERSION:=d2bbeb7d42b45e4d97411e5c124845905975fd46
-PKG_MIRROR_HASH:=4a96b819444d7f2a464e5a21c0234f36ae238f9be6814307fb617899c62b6be1
+PKG_SOURCE_DATE:=2018-07-26
+PKG_SOURCE_VERSION:=aa8846bb101054392b81f09bade120c021695892
+PKG_MIRROR_HASH:=cc2ff632744bdefbc64ad11dc18944b44af006c986367a28d6483ade6012effa
 PKG_MAINTAINER:=Jo-Philipp Wich <[email protected]>
 PKG_LICENSE:=ISC