Use nullptr instead of 0 in zlib_bench pointers

A recently CL had a clang-tidy bot call out using a 0 instead of
a nullptr for pointers. But the change in that CL wasn't the only
location where this was happening.

This CL updates all the 0-as-pointer locations in zlib_bench.

Change-Id: I7b9b0576431fb32974085046ca9174b527f08b7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149908
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Chris Blume <cblume@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#759154}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 476c6b7cc236852c1da5b56f4dc972879372eeaf
1 file changed