savecache: fix check for $RC_LIBEXECDIR writability

We were originally checking to see if $RC_LIBEXECDIR/cache was writable. For
a new install, this check will fail since this path does not exist. This
is also incorrect because later we create $RC_LIBEXECDIR/cache.

The correct check is checkpath -W $RC_LIBEXECDIR, and this fixes the
issue.

X-Gentoo-Bug: 544632
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=544632

init.d/savecache.in

@@ -13,8 +13,8 @@ start()
 			return 1
 		fi
 	fi
-	if [ -e "$RC_LIBEXECDIR"/cache ] && ! checkpath -W "$RC_LIBEXECDIR"/cache; then
-		ewarn "WARNING: ${RC_LIBEXECDIR}/cache is not writable!"
+	if ! checkpath -W "$RC_LIBEXECDIR"; then
+		ewarn "WARNING: ${RC_LIBEXECDIR} is not writable!"
 		if ! yesno "${RC_GOINGDOWN}"; then
 			ewarn "Unable to save deptree cache"
 			return 1