[source] firewall: update to the latest version, fixes a gcc7 build error

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/60241e52db9b30cbec57a99f616a2c7e650b31c4

commit 60241e52db9b30cbec57a99f616a2c7e650b31c4
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu May 4 16:11:27 2017 +0200

    firewall: update to the latest version, fixes a gcc7 build error
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/network/config/firewall/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/package/network/config/firewall/Makefile b/package/network/config/firewall/Makefile
index 0f52ab9..080ca06 100644
--- a/package/network/config/firewall/Makefile
+++ b/package/network/config/firewall/Makefile
@@ -13,9 +13,9 @@ PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/firewall3.git
-PKG_SOURCE_DATE:=2017-02-07
-PKG_SOURCE_VERSION:=1949e0cc6feb17d7c32312040da6fc75ea771035
-PKG_MIRROR_HASH:=184a9fc1be4ff6778b0a0fd68b0cbd8458cd7fbe2a9b5d4b1af6fc305a22dca8
+PKG_SOURCE_DATE:=2017-05-09
+PKG_SOURCE_VERSION:=c328d1f6fe982888b5f5852423ee0a41cee3adb1
+PKG_MIRROR_HASH:=ca7d5aa038489afa9241ba36781c70237a41f8c4622612c933ea452b6d0c6ece
 PKG_MAINTAINER:=Jo-Philipp Wich <jo at mein.io>
 PKG_LICENSE:=ISC