driver core: attribute_container: Unwind device_add() on attr failure

attribute_container_add_class_device() first calls device_add() and then
creates the container attributes. If attribute_container_add_attrs() fails,
the helper returns the error with the class device still registered.

Callers use an error from this helper as a failed add and do not call
device_del() on that path. Undo the successful device_add() before
returning the attribute creation error.

Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
Link: https://patch.msgid.link/20260608172717.88657-1-dbgh9129@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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