[logging] fix always zero count for modified files
[logging] fix always zero count for modified files

Summary: The counter that accumulates the number of modified source files was logged before it is computed, leading to always zero results.

Reviewed By: jvillard

Differential Revision: D28505378

fbshipit-source-id: 833fb6072

jvillard/infer,jvillard/infer,facebook/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer