pmdomain: thead: Fix error pointer vs NULL bug in th1520_pd_reboot_init()

The devm_auxiliary_device_create() returns NULL on error. It never
returns error pointers. Using PTR_ERR_OR_ZERO() here means the function
always returns success. Replace the PTR_ERR_OR_ZERO() call check with
a NULL check.

Fixes: 64581f41f4c4 ("pmdomain: thead: create auxiliary device for rebooting")
Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Icenowy Zheng <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/pmdomain/thead/th1520-pm-domains.c

···
 	struct auxiliary_device *adev;
 
 	adev = devm_auxiliary_device_create(dev, "reboot", aon_chan);
+	if (!adev)
+		return -ENODEV;
 
-	return PTR_ERR_OR_ZERO(adev);
+	return 0;
 }
 
 static int th1520_pd_probe(struct platform_device *pdev)