Revert "Zlib patch: prevent uninitialized use of state->check"

This reverts commit f4b484415281f09d0bbc0880f5d41dbdde96c209.

Reason for revert: need to revert previous CL, which this depends on (because it added contrib/arm/inflate.c).

Original change's description:
> Zlib patch: prevent uninitialized use of state->check
> 
> No need to call the Adler32 checksum function, just set the
> struct field to the expected value.
> 
> Upstream bug: madler/zlib#245
> 
> Bug: chromium:697481
> Change-Id: Ib972cc2507c8e7ca0b0b48464db33880ef960fb8
> Reviewed-on: https://chromium-review.googlesource.com/644505
> Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#498998}

TBR=scroggo@chromium.org,agl@chromium.org,cavalcantii@chromium.org,npm@chromium.org,cblume@chromium.org,mtklein@chromium.org,adenilson.cavalcanti@arm.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:697481
Change-Id: I12c6ca6867d1d7e97c9f372f2d592ed75d51f093
Reviewed-on: https://chromium-review.googlesource.com/669480
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#502449}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 4e96bed9f68c0d6ae106c1042a3041eafcf59b9a

1 files changed, 1 insertions, 2 deletions

diff --git a/inflate.c b/inflate.c
index cc38b98..69b769a 100644
--- a/inflate.c
+++ b/inflate.c
@@ -228,8 +228,7 @@ int stream_size;
     state->strm = strm;
     state->window = Z_NULL;
     state->mode = HEAD;     /* to pass state test in inflateReset2() */
-    /* 1L is the result of adler32() on zero length data */
-    state->check = 1L;
+    state->check = adler32(0L, Z_NULL, 0);
     ret = inflateReset2(strm, windowBits);
     if (ret != Z_OK) {
         ZFREE(strm, state);