RDMA/iwcm: Simplify cm_work_handler()

Instead of complicating the code to avoid a spin_lock_irqsave() /
spin_lock_irqrestore() pair before returning, simplify the code by removing
the local variable 'empty'.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240605145117.397751-5-bvanassche@acm.org


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