RDMA/rxe: Remove the repeated 'mr->umem = umem'

Drop duplicated code

Link: https://lore.kernel.org/r/20210702123024.37025-1-ice_yangxiao@163.comSigned-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>
Reviewed-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_mr.c

@@ -122,7 +122,6 @@ int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova,
 		goto err1;
 	}
 
-	mr->umem = umem;
 	num_buf = ib_umem_num_pages(umem);
 
 	rxe_mr_init(access, mr);