RDMA/rxe: Don't overwrite errno from ib_umem_get()

stable inclusion
from linux-4.19.198
commit 92aa20a768b4a1b30242801c39d61b51c6127ffe

--------------------------------

[ Upstream commit 20ec0a6d ]

rxe_mr_init_user() always returns the fixed -EINVAL when ib_umem_get()
fails so it's hard for user to know which actual error happens in
ib_umem_get(). For example, ib_umem_get() will return -EOPNOTSUPP when
trying to pin pages on a DAX file.

Return actual error as mlx4/mlx5 does.

Link: https://lore.kernel.org/r/20210621071456.4259-1-ice_yangxiao@163.comSigned-off-by: NXiao Yang <yangx.jy@fujitsu.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/infiniband/sw/rxe/rxe_mr.c

@@ -175,7 +175,7 @@ int rxe_mem_init_user(struct rxe_pd *pd, u64 start,
 	if (IS_ERR(umem)) {
 		pr_warn("err %d from rxe_umem_get\n",
 			(int)PTR_ERR(umem));
-		err = -EINVAL;
+		err = PTR_ERR(umem);
 		goto err1;
 	}