scripts/systemd-autofs-restart.sh: fix variable name

The script checks if $NSENTER is executable and sets $NS_ENTER if not.
This seems to be a typo (once with '_' and once without).

Untested and not reproducible. It just looks wrong.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

scripts/systemd-autofs-restart.sh

@@ -27,7 +27,7 @@ if [ ! -d "/proc/$CRTOOLS_INIT_PID" ]; then
 fi
 
 NS_ENTER=/bin/nsenter
-[ ! -x $NSENTER ] || NS_ENTER=/usr/bin/nsenter
+[ ! -x $NS_ENTER ] || NS_ENTER=/usr/bin/nsenter
 
 if [ ! -x $NS_ENTER ]; then
 	echo "$NS_ENTER binary not found"