rust: devres: remove action in `Devres::drop`

rust: devres: remove action in `Devres::drop`

So far `DevresInner` is kept alive, even if `Devres` is dropped until
the devres callback is executed to avoid a WARN() when the action has
been released already.

With the introduction of devm_remove_action_nowarn() we can remove the
action in `Devres::drop`, handle the case where the action has been
released already and hence also free `DevresInner`.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Link: https://lore.kernel.org/r/20250107122609.8135-2-dakr@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>