RDMA/iwcm: Simplify cm_event_handler()

queue_work() can test efficiently whether or not work is pending. Hence,
simplify cm_event_handler() by always calling queue_work() instead of only
if the list with pending work is empty.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240605145117.397751-4-bvanassche@acm.org


Signed-off-by: Leon Romanovsky <leon@kernel.org>