sysfs: Use PTR_ERR_OR_ZERO()

Fix ptr_ret.cocci warnings:
fs/sysfs/group.c:409:8-14: WARNING: PTR_ERR_OR_ZERO can be used

Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci
Signed-off-by: Vasyl Gomonovych <gomonovych@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/sysfs/group.c

@@ -406,6 +406,6 @@ int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
 
 	kernfs_put(entry);
 	kernfs_put(target);
-	return IS_ERR(link) ? PTR_ERR(link) : 0;
+	return PTR_ERR_OR_ZERO(link);
 }
 EXPORT_SYMBOL_GPL(__compat_only_sysfs_link_entry_to_kobj);