He did, but I have to question whether he actually hurt out national interests by doing it. The PRC basically owns the Clintons - they're bought and paid for. I have to assume anything Hillary is authorized to know about, they already knew about before Snowden.
HRC has not, to my knowledge, provided the PRC with externally verifiable proof of US intelligence activity against it that it could use as evidence in the court of world opinion.
Even if she had, two wrongs still do not make a right.