Typo in GCDWebServerGZipDecoder:open
I haven't tested or dug into this, as I just happened to spot it while looking through a colleagues code.
It looks like `inflateInit2` is called and then `deflateEnd` on error. I'm wondering if this is a copy and paste issue from `GCDWebServerGZipEncoder` and really it should be `inflateEnd` here instead?