We should return -ENOMEM if the kzalloc() fails.  We currently return
success.

Fixes: 69ad0e7f ("RDMA/qedr: Add support for iWARP in user space")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>