staging: unisys: correctly handle return value from queue_delayed_work()

commit f84bd626 upstream.

Properly handle the return value from queue_delayed_work() - it's a
bool, not an int, so using a less than comparison isn't appropriate.

This mistake was found by David Binderman <dcb314@hotmail.com>.

[arnd: the fix is from 4.4 but needed some minor fixup to adapt
 to context changes]
Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/staging/unisys/visorutil/periodic_work.c

@@ -98,8 +98,8 @@ BOOL visor_periodic_work_nextperiod(struct periodic_work *pw)
 		pw->want_to_stop = FALSE;
 		rc = TRUE;  /* yes, TRUE; see visor_periodic_work_stop() */
 		goto unlock;
-	} else if (queue_delayed_work(pw->workqueue, &pw->work,
-				      pw->jiffy_interval) < 0) {
+	} else if (!queue_delayed_work(pw->workqueue, &pw->work,
+				       pw->jiffy_interval)) {
 		ERRDEV(pw->devnam, "queue_delayed_work failed!");
 		pw->is_scheduled = FALSE;
 		rc = FALSE;
@@ -134,8 +134,8 @@ BOOL visor_periodic_work_start(struct periodic_work *pw)
 		goto unlock;
 	}
 	INIT_DELAYED_WORK(&pw->work, &periodic_work_func);
-	if (queue_delayed_work(pw->workqueue, &pw->work,
-			       pw->jiffy_interval) < 0) {
+	if (!queue_delayed_work(pw->workqueue, &pw->work,
+				pw->jiffy_interval)) {
 		ERRDEV(pw->devnam, "%s queue_delayed_work failed!", __func__);
 		rc = FALSE;
 		goto unlock;