sysmon: Fix yet another typo

This is the third typo I have had to fix in this bit of copy-pasted
code.

BUG=chromium:736911
BUG=chromium:737146
BUG=chromium:737217
TEST=None

Change-Id: I14ed0337c64c58bc4868aff2a338eddc9a51eb3d
Reviewed-on: https://chromium-review.googlesource.com/553458
Reviewed-by: Paul Hobbs <phobbs@google.com>
Tested-by: Allen Li <ayatane@chromium.org>
1 file changed