create_workqueue is deprecated.  The workqueue usage does not seem to
demand any special treatment, so do not set any flags either.
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
Tested-by: NLarry Finger <Larry.Finger@lwfinger.net>
Acked-by: NTejun Heo <tj@kernel.org>