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: 5abcd199 am: ac6cea2d am: 771c40a4 am: 7eb9f391

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/zlib/+/20545971



Change-Id: Iedc4977ad9a8f4d00398e8ac2167668a4ed8b9f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>