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Do the same for png_zlib_inflate().

Change-Id: I43357020646585d38075b59fb9d24390654c5587
Reviewed-on: https://chromium-review.googlesource.com/1205672Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588913}