Cleanup: ignore error from Wait()
Cleanup: ignore error from Wait()

This is to fix a warning from golangci-lint. As we do not have a way to
return the error here, deliberately ignore it.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

checkpoint-restore/go-criu,checkpoint-restore/go-criu,checkpoint-restore/go-criu