tcmu-runner: fix the resource released when exception exits in main
tcmu-runner: fix the resource released when exception exits in main

Signed-off-by: tangwenji <ad0e6531e466391ac7606aff432ef2be0306b52b@zte.com.cn>

agrover/tcmu-runner,open-iscsi/tcmu-runner,open-iscsi/tcmu-runner