Fix a bug when getting a gzip header extra field with inflate(). am:...

Fix a bug when getting a gzip header extra field with inflate(). am: f8b8a908 am: 2cde1caa am: 10dfbbc9 am: 08ac66a6 am: be40c5ab

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/zlib/+/20545896



Change-Id: If9f821a0b04999d14e05b76f3b0a256c5bb3da59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>