zlib: Fix extra field processing bug that dereferences NULL state->head.
The recent commit to fix a gzip header extra field processing bug
introduced the new bug fixed here.
(cherry picked from zlib commit 1eb7682f845ac9e9bf9ae35bbfb3bad5dacbd91d)
zlib: Fix extra field processing bug that dereferences NULL state->head. Tags None Referenced Files None Subscribers None
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