Integrating a bug fix in cgzip from outside.
Integrating a bug fix in cgzip from outside.

LGTM Sugu.

nso95/vitess,nso95/vitess,fanngyuan/vitess,fanngyuan/vitess,nso95/vitess,fanngyuan/vitess,fanngyuan/vitess,nso95/vitess,fanngyuan/vitess,nso95/vitess