systemd-autofs-restart.sh: do not treat absence on bindmount as error

There can be autofs direct mount point without target mount on top.
In this case there won't be any bindmount and nothing to restore on top of the
autofs mount point.
Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/systemd-autofs-restart.sh

@@ -107,7 +107,7 @@ function save_mountpoint {
 function restore_mountpoint {
 	local mountpoint=$1
 
-	[ -n "$bindmount" ] || exit 1
+	[ -n "$bindmount" ] || return
 
 	# Umount file system, remounted by systemd, if any
 	if ! check_fs_type $mountpoint "autofs"; then