darkstat: correct incompatbility with sshd

The init file of darkstat is creating the pid in /var/empty and
setting the owner of the directory to darkstat which is incompatible
with sshd as sshd requires /var/empty to be owned by root and not
group or world-writable.  See issue #12420.

This corrects the problem by creating another directory: /var/darkstat
instead without setting the owner, which is not actually required.
Compile tested: not applicable as the changes do not involve
compilation.
Tested on my home router running darkstat.

Signed-off-by: Jean-Michel Lacroix <lacroix@lepine-lacroix.info>

net/darkstat/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=darkstat
 PKG_VERSION:=3.0.719
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_MAINTAINER:=Jean-Michel Lacroix <lacroix@lepine-lacroix.info>
 

net/darkstat/files/darkstat.init

@@ -6,7 +6,7 @@ USE_PROCD=1
 START=60
 
 APP=darkstat
-RUN_D=/var/empty
+RUN_D=/var/darkstat
 PID_F=$RUN_D/$APP.pid
 CONFIGNAME=darkstat
 USER=nobody
@@ -30,7 +30,6 @@ export_bool () {
 
 set_config_string(){
 	mkdir -p $RUN_D
-	chown $USER:$GROUP $RUN_D
 	. /lib/functions/network.sh
 	config_load $CONFIGNAME
 	config_foreach build_config_string darkstat