scripts: terminate systemd-autofs-restart.sh if saved mountpoint is missing

restore_mountpoint() should never be called without saved mountpoint.
If this happens, this is bug in script logic, which needs fixing.
https://jira.sw.ru/browse/PSBM-44207Signed-off-by: Eugene Kolomeetz <klm@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 "$bindmount" ] || exit 0
+	[ -n "$bindmount" ] || exit 1
 
 	# Umount file system, remounted by systemd, if any
 	if ! check_fs_type $mountpoint "autofs"; then