Staging: ipack/devices/ipoctal: Check tty_register_device return value.
Signed-off-by: NJens Taprogge <jens.taprogge@taprogge.org> Signed-off-by: NSamuel Iglesias Gonsalvez <siglesias@igalia.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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