scripts: detect EOF on read in a usual way in systemd-autofs-restart.sh

When read bultin detects EOF, it sets empty string as value of specified
variable, and returns non-zero exit code. So we can rely just on exit
code, and not check variable value. This is standard approach.
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

@@ -59,7 +59,7 @@ function check_fs_type {
 	local top_mount_id=""
 	local top_mount_fs_type=""
 
-	while IFS='' read -r line || [[ -n "$line" ]]; do
+	while IFS='' read -r line; do
 		# Skip those entries which do not match the mountpoint
 		[ "$(echo $line | awk '{print $5;}')" = "$mountpoint" ] || continue