zabbix: do not error in postinst when no ubusd

Now that post install is running properly, when CI executes the
tests the zabbix-extra-* packages that have a posinst exit the
post install with an error if ubusd is not running.

Drop the error code from killall with no usbd running to fix this.

Signed-off-by: Daniel F. Dickinson <dfdpublic@wildtechgarden.ca>

admin/zabbix/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zabbix
 PKG_VERSION:=7.0.27
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://cdn.zabbix.com/zabbix/sources/stable/$(basename $(PKG_VERSION))/ \
@@ -581,7 +581,7 @@ endef
 define Package/zabbix-extra-network/postinst
 #!/bin/sh
 if [ -z "$${IPKG_INSTROOT}" ]; then
-  killall -s HUP ubusd
+  killall -s HUP ubusd || true
 fi
 endef
 
@@ -594,7 +594,7 @@ endef
 define Package/zabbix-extra-wifi/postinst
 #!/bin/sh
 if [ -z "$${IPKG_INSTROOT}" ]; then
-  killall -s HUP ubusd
+  killall -s HUP ubusd || true
 fi
 endef