workqueue: fix dev_set_uevent_suppress() imbalance

Uevents are suppressed during attributes registration, but never
restored, so kobject_uevent() does nothing.

Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 226223ab3c4118ddd10688cc2c131135848371ab

kernel/workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 6203d29..6f5f9c7 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3284,6 +3284,7 @@
 		}
 	}
 
+	dev_set_uevent_suppress(&wq_dev->dev, false);
 	kobject_uevent(&wq_dev->dev.kobj, KOBJ_ADD);
 	return 0;
 }