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

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



Change-Id: I373375b1484c76ac53c138225488d0cb88c5e774
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>