The old state is helpful for debugging, as the current state is always
IB_CM_IDLE when timeout happens.

Fixes: 96d9cbe2 ("RDMA/cm: add timeout to cm_destroy_id wait")
Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/20240322112049.2022994-1-markzhang@nvidia.comSigned-off-by: Leon Romanovsky <leon@kernel.org>