[ Upstream commitc79a707072] Set the disconnected flag before releasing the data interface in case netdev registration fails to avoid having the disconnect callback try to deregister the never registered netdev (and trigger a WARN_ON()). Fixes:87cf65601e("USB host CDC Phonet network interface driver") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>