samba4: update to 4.9.4

Fixes following CVEs (4.9.3 and 4.9.4):
CVE-2018-16853, CVE-2018-14629, CVE-2018-16853
CVE-2018-14629, CVE-2018-16841, CVE-2018-16851
CVE-2018-16852, CVE-2018-16853, CVE-2018-16857

Signed-off-by: Deng Qingfang <dengqf6@mail2.sysu.edu.cn>

net/samba4/Makefile

@@ -2,7 +2,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=samba
-PKG_VERSION:=4.9.2
+PKG_VERSION:=4.9.4
 PKG_RELEASE:=1
 
 PKG_MAINTAINER:=Andy Walsh <andy.walsh44+github@gmail.com>
@@ -11,7 +11,7 @@ PKG_LICENSE_FILES:=COPYING
 
 PKG_SOURCE_URL:=https://download.samba.org/pub/samba/stable/
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_HASH:=349c17b7bf1bf667167843470533da89ff1b2ca4a768b529aaacf5197af1efa2
+PKG_HASH:=6d98a8d8bcccbe788e4bbb406362e6676311aca711a3f3cc9b3a404bb9ff0b4f
 
 # Buildroot bug? Can't add target deps via '+SAMBA4_SERVER_AD_DC:python-crypto' (as work-around we select via config.in)
 PKG_BUILD_DEPENDS:=SAMBA4_SERVER_AD_DC:python-crypto nfs-kernel-server/host