nut: fix _ handling

Taken from https://github.com/openwrt/packages/issues/13359

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/nut/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=nut
 PKG_VERSION:=2.7.4
-PKG_RELEASE:=20
+PKG_RELEASE:=21
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.networkupstools.org/source/2.7/

net/nut/files/nut-server.init

@@ -179,11 +179,11 @@ build_driver_config() {
 	defoverride() {
 		local overvar="$1"
 		local defover="$2"
-		local overtype="$(echo "$overvar" | tr '.' '_')"
+		local overtype="$(echo "$overvar" | tr '_' '.')"
 		local overval
 
-		config_get overval "${defover}_${overtype}" value
-		[ -n "$overval" ] && echo "${defover}.${overvar} = $overval" >>"$UPS_C"
+		config_get overval "${defover}_${overvar}" value
+		[ -n "$overval" ] && echo "${defover}.${overtype} = $overval" >>"$UPS_C"
 	}
 
 	config_list_foreach "$cfg" override defoverride override