R1:1b12249b2ca3

Fix some format strings

Summary: These format strings use `%d` instead of `%s`.

Test Plan: Eyeball it.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12996