netifd: update to latest git HEAD

fix a compile error

Signed-off-by: John Crispin <john@phrozen.org>

package/network/config/netifd/Makefile

@@ -6,8 +6,8 @@ PKG_RELEASE:=1
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/netifd.git
 PKG_SOURCE_DATE:=2018-07-30
-PKG_SOURCE_VERSION:=75ee79052e2307a7eac2d1e12712b0a8f051b4c4
+PKG_SOURCE_VERSION:=a0a1e52eb300b574098ae18fc7e6849ff50c2e5e
-PKG_MIRROR_HASH:=9f14e148d2f251c832da59f4b19f304feb114e0bb82425b23510615beee989d8
+PKG_MIRROR_HASH:=f2a556e0de1e04d4e7b6ca30d3e7c65710659201fc81efb10420cd895d72a307
 PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 
 PKG_LICENSE:=GPL-2.0