USB: cdc-acm: do not log successful probe on later errors

[ Upstream commit 79579411 ]

Do not log the successful-probe message until the tty device has been
registered.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210322155318.9837-9-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 64690a90 ("cdc-acm: fix race between initial clearing halt and open")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>