Do not set an exit status in dhclient-script.

From a post that I dug up from Brooks:

Why on earth are you exiting with $1 as the status?  This is almost
certainly the problem.  You should not exit from dhclient-exit-hooks
at all since it occurs in the context of dhclient-script and this exit
values is entirely bogus.

sbin/dhclient-script

@@ -202,8 +202,6 @@ add_new_resolv_conf() {
 exit_with_hooks() {
 	echo $interface > /tmp/rc.newwanip
 	echo $old_ip_address > /tmp/rc.newwanip_oldip
-	# probably should do something with exit status of the local script
-	exit 0
 }
 
 #