[ Upstream commit c6cecf4ae44e4ce9158ef8806358142c3512cd33 ] Add some defensive coding in case one of the subprocesses created by tdc returns nothing. If no object is returned from exec_cmd, then tdc will halt with an unhandled exception. Signed-off-by: Brenda J. Butler <bjb@mojatatu.com> Signed-off-by: Lucas Bates <lucasb@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>