claw: replace PTR_RET with PTR_ERR_OR_ZERO

PTR_RET is deprecated. Do not recommend its usage anymore.
Use PTR_ERR_OR_ZERO instead.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/claw.c b/drivers/s390/net/claw.c
index fd7b3bd..d837c3c 100644
--- a/drivers/s390/net/claw.c
+++ b/drivers/s390/net/claw.c
@@ -3348,7 +3348,7 @@
 	}
 	CLAW_DBF_TEXT(2, setup, "init_mod");
 	claw_root_dev = root_device_register("claw");
-	ret = PTR_RET(claw_root_dev);
+	ret = PTR_ERR_OR_ZERO(claw_root_dev);
 	if (ret)
 		goto register_err;
 	ret = ccw_driver_register(&claw_ccw_driver);