Initialize 'ret' to avoid possible uninitialized read.

Initialize 'ret' to avoid possible uninitialized read.

When running VC++'s /analyze it says:
src\chrome\installer\mini_installer\mini_installer.cc(217) : warning
C6001: Using uninitialized memory 'ret'.

This may be a false positive but if reg is guaranteed to be initialized
before it is read then this guarantee is very subtle. The safe thing to
do is to initialize it.

This potential bug was introduce in December 2010 in:
http://codereview.chromium.org/5875003

BUG=427616
Committed: https://crrev.com/5f870d2cf372ae6f1f2631ada6721a4164d6b87f
Cr-Commit-Position: refs/heads/master@{#307056}

[brucedawson, 2014-12-05 00:25:16]

brucedawson@chromium.org changed reviewers:
+ grt@chromium.org

[grt (UTC plus 2), 2014-12-05 18:43:14]

The CQ bit was checked by grt@chromium.org

[grt (UTC plus 2), 2014-12-05 18:43:14]

lgtm

[commit-bot: I haz the power, 2014-12-05 18:43:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/780983002/1

[commit-bot: I haz the power, 2014-12-05 19:24:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-05 19:24:52]

Patchset 1 (id:??) landed as
https://crrev.com/5f870d2cf372ae6f1f2631ada6721a4164d6b87f
Cr-Commit-Position: refs/heads/master@{#307056}