RDMA/iwcm: Change the return type of iwcm_deref_id()

Since iwcm_deref_id() returns either 0 or 1, change its return type from
'int' into 'bool'.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240605145117.397751-3-bvanassche@acm.org


Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>