Fix a bug when getting a gzip header extra field with inflate(). am: f8b8a908

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



Change-Id: I4fc14e0877f6c601661d16421234ee5de89086db
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>