ACPI: APEI: EINJ: Fix einj_dev release leak

The platform driver conversion of EINJ mistakenly used
platform_device_del() to unwind platform_device_register_full() at
module exit. This leads to a small leak of one 'struct platform_device'
instance per module load/unload cycle. Switch to
platform_device_unregister() which performs both device_del() and final
put_device().

Fixes: 5621fafaac00 ("EINJ: Migrate to a platform driver")
Cc: 6.9+ <[e-mail]> # 6.9+
Signed-off-by: Dan Williams <[e-mail]>
Reviewed-by: Ben Cheatham <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/apei/einj-core.c

···
 	if (einj_initialized)
 		platform_driver_unregister(&einj_driver);
 
-	platform_device_del(einj_dev);
+	platform_device_unregister(einj_dev);
 }
 
 module_init(einj_init);