USB: cdc-acm: clean up probe error labels

Name the probe error labels after what they do rather than using
sequence numbers which is harder to review and maintain (e.g. may
require renaming unrelated labels when a label is added or removed).

Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210322155318.9837-6-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>