usb: typec: stusb160x: fix an IS_ERR() vs NULL check in probe

The typec_register_port() function doesn't return NULL, it returns error
pointers.

Fixes: da0cb631 ("usb: typec: add support for STUSB160x Type-C controller family")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20201023114017.GE18329@kadamSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/stusb160x.c

@@ -730,8 +730,8 @@ static int stusb160x_probe(struct i2c_client *client)
 	}
 
 	chip->port = typec_register_port(chip->dev, &chip->capability);
-	if (!chip->port) {
-		ret = -ENODEV;
+	if (IS_ERR(chip->port)) {
+		ret = PTR_ERR(chip->port);
 		goto all_reg_disable;
 	}