RDMA/mana_ib: Fix error code in probe()

Return -ENOMEM if dma_pool_create() fails.  Don't return success.

Fixes: df91c470 ("RDMA/mana_ib: create/destroy AH")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/2bbe900e-18b3-46b5-a08c-42eb71886da6@stanley.mountain


Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>