RDMA/efa: Remove umem check on dereg MR flow

EFA driver is not a kverbs provider, the check for MR umem is redundant.

Link: https://lore.kernel.org/r/20190826115350.21718-2-galpress@amazon.comReviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/efa/efa_verbs.c

@@ -1500,14 +1500,12 @@ int efa_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
 
 	ibdev_dbg(&dev->ibdev, "Deregister mr[%d]\n", ibmr->lkey);
 
-	if (mr->umem) {
 	params.l_key = mr->ibmr.lkey;
 	err = efa_com_dereg_mr(&dev->edev, &params);
 	if (err)
 		return err;
-	}
-	ib_umem_release(mr->umem);
 
+	ib_umem_release(mr->umem);
 	kfree(mr);
 
 	return 0;