metrics: fix clang syntax checking error.

This fixes the two errors in the clang syntax.

BUG=chromium:240325
TEST=FEATURES="test" emerge-lumpy metrics

Change-Id: I57ab09fbd3dba2b394c606a3b2ba1ad799607939
Reviewed-on: https://gerrit.chromium.org/gerrit/50999


Reviewed-by: Darin Petkov <petkov@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>