platform/x86: wmi: Avoid returning AE_OK upon unknown error

If an error code other than EINVAL, ENODEV or ETIME is returned
by ec_read()/ec_write(), then AE_OK is wrongly returned.

Fix this by only returning AE_OK if the return code is 0, and
return AE_ERROR otherwise.

Tested on a Dell Inspiron 3505 and a Asus Prime B650-Plus.

Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Signed-off-by: Armin Wolf <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Hans de Goede <[email protected]>

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