usb: hso: check for return value in hso_serial_common_create()
[ Upstream commit e911e99a ] in case of an error tty_register_device_attr() returns ERR_PTR(), add IS_ERR() check Reported-and-tested-by: <syzbot+67b2bd0e34f952d0321e@syzkaller.appspotmail.com> Link: https://syzkaller.appspot.com/bug?extid=67b2bd0e34f952d0321e Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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