RDMA/nes: Clean up a condition

We don't need to test "ret" twice and also the white space is messed up.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>