[bug] pnp_register_card_driver/pnp_unregister_card_driver

[matthieu castet]

Hi,

pnp_register_driver could fail and return <0 result, in this case the 
driver shouldn't be pnp_unregister_driver.

But if you look in pnp_register_card_driver, the result isn't checked. 
And it is always pnp_unregister_driver in pnp_unregister_card_driver.

I know that pnp_register_card_driver shouldn't fail in normal condition, 
but who know...


Matthieu
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