RDMA/siw: Correct wrong debug message

We need to print num_sle first then pbl->max_buf per the condition.
Also replace mem->pbl with pbl while at it.

Fixes: 303ae1cd ("rdma/siw: application interface")
Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20230821133255.31111-3-guoqing.jiang@linux.dev


Acked-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>