[zip] Simplify ZipReader::ExtractCurrentEntry

No need to use a dynamically allocated buffer.

Also added ERROR logs.

BUG=chromium:1295127
TEST=autoninja -C out/Default zlib_unittests && out/Default/zlib_unittests

Change-Id: I99ffcaa24815be1f74164132109f1855aca1be08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3445923


Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#968827}
NOKEYCHECK=True
GitOrigin-RevId: 123ca7a96860c51ed7bbfce32493920317890bc4