powerpc/pseries/vas: Call misc_deregister if sysfs init fails

Undo effects of misc_register if sysfs init fails after
misc_register.
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220511033507.2745992-1-zhengbin13@huawei.com

arch/powerpc/platforms/pseries/vas-sysfs.c

@@ -248,6 +248,7 @@ int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps)
 	pseries_vas_kobj = kobject_create_and_add("vas0",
 					&vas_miscdev.this_device->kobj);
 	if (!pseries_vas_kobj) {
+		misc_deregister(&vas_miscdev);
 		pr_err("Failed to create VAS sysfs entry\n");
 		return -ENOMEM;
 	}
@@ -259,6 +260,7 @@ int __init sysfs_pseries_vas_init(struct vas_all_caps *vas_caps)
 		if (!gzip_caps_kobj) {
 			pr_err("Failed to create VAS GZIP capability entry\n");
 			kobject_put(pseries_vas_kobj);
+			misc_deregister(&vas_miscdev);
 			return -ENOMEM;
 		}
 	}