Commit f0626710 ("RDMA: Update workqueue usage") introduced ib_wq
and removed the use of flush_scheduled_work(); however, during the merge
process one chunk was lost in ib_sa_remove_one().  Fix it.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NRoland Dreier <roland@purestorage.com>