staging: lustre: lnet/selftest: don't ignore status from lstcon_test_add

If lstcon_test_add sets 'ret' (passed by reference) to 1,
then lst_test_add_ioctl() ignores the return value.
This isn't justified - the return value must be zero for 'ret'
to be meaningful.
Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/selftest/conctl.c

@@ -670,7 +670,7 @@ static int lst_test_add_ioctl(struct lstio_test_args *args)
 			     args->lstio_tes_param_len,
 			     &ret, args->lstio_tes_resultp);
 
-	if (ret)
+	if (!rc && ret)
 		rc = (copy_to_user(args->lstio_tes_retp, &ret,
 				   sizeof(ret))) ? -EFAULT : 0;
 out: