RDMA/rxe: Cleanup mr_check_range

Remove blank lines and replace EFAULT by EINVAL when an invalid
mr type is used.

Link: https://lore.kernel.org/r/20230119235936.19728-2-rpearsonhpe@gmail.com


Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>