driver core: attribute_container: change return type to void

driver core: attribute_container: change return type to void

attribute_container_register() has always returned 0 since its
introduction in commit 06ff5a987e ("Add attribute container to generic
device model") in the historical Linux tree [1]. Convert the return type
to void and update all callers.

This removes dead code where callers checked for errors that could never
occur.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Link: https://patch.msgid.link/20251220-dev-attribute-container-linux-scsi-v1-1-d58fcd03bf21@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>