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: 1c4806af am: 9166f7db am: 2cf9f01b am: 8a773bf1 am: 6c697389 am: c5732312 am: 813240c4 am: d0ecf1e6 am: c9fd6b87

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/zlib/+/20545926



Change-Id: Ie68cff8bb3c3dd541f13de01be96b7996d7c94fc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>