GitLab

Fixes several clang/win errors like
..\..\sandbox\win\sandbox_poc\pocdll\registry.cc(24,10) :  error(clang): value of type 'HKEY' (aka 'HKEY__ *') is not implicitly convertible to 'LONG_PTR' (aka 'long')
    case HKEY_USERS:
         ^~~~~~~~~~

Also fix a format string warning while here.

No intended behavior change.
BUG=82385

Review URL: https://codereview.chromium.org/542863002

Cr-Commit-Position: refs/heads/master@{#293540}