do not delete addresses when stopping a ppp interface.

This is important in situations where ppp is being used in a demand
dialing setup.

X-Gentoo-Bug: 359069
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=359069

init.d/net.lo.in

@@ -684,8 +684,12 @@ stop()
 
 	# Only delete addresses for interfaces that exist
 	if _exists; then
+		# PPP can manage it's own addresses when IN_BACKGROUND
+		# Important in case "demand" set on the ppp link
+		if ! (yesno ${IN_BACKGROUND} && is_ppp) ; then
 			_delete_addresses "${IFACE}"
 		fi
+	fi
 
 	for module in ${MODULES}; do
 		if [ "$(command -v "${module}_post_stop")" = "${module}_post_stop" ]; then