sshtunnel: Update init script

This replaces the use of uci_validate_section() with
uci_load_validate(), which removes the need to declare local variables
for every config option.

This also fixes some validation, makes variable declarations local,
removes unnecessary curly brackets.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

net/sshtunnel/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=sshtunnel
 PKG_VERSION:=4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=GPL-2.0+
 
 PKG_MAINTAINER:=Nuno Goncalves <nunojpg@gmail.com>