nvmem: change the signature of nvmem_unregister()

We switched the nvmem framework to using kref instead of manually
checking the current number of users in nvmem_unregister() so this
function can no longer fail. We also converted all remaining users
that still checked the return value of nvmem_unregister() to using
devm_nvmem_register(). Make the routine return void.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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