workqueue.c: Increase workqueue name length

[ Upstream commit 31c89007 ]

Currently we limit the size of the workqueue name to 24 characters due to
commit ecf6881f ("workqueue: make workqueue->name[] fixed len")
Increase the size to 32 characters and print a warning in the event
the requested name is larger than the limit of 32 characters.

Signed-off-by: Audra Mitchell <audra@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Stable-dep-of: 5797b1c1 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues")
Signed-off-by: Sasha Levin <sashal@kernel.org>