localmount: Only unmount local filesystems if we are shutting down

Make the stop function in localmount only unmount file systems when the
system is going down.

reported-by: Alexey Prokopchuk <alexpro@homelan.lg.ua>
X-Gentoo-Bug: 407167
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=407167

init.d/localmount.in

@@ -33,6 +33,7 @@ start()
 
 stop()
 {
+	yesno $RC_GOINGDOWN || return 0
 	# We never unmount / or /dev or $RC_SVCDIR
 
 	# Bug 381783