We should return -ENOMEM if the allocation fails.  (The current code
returns succees).

Fixes: 37cb11ac ("RDMA/bnxt_re: Add SRQ support for Broadcom adapters")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-By: NDevesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>