Avoid repeated logging of the file name when ReadConfig returns an am: d73181d1a0 am: 6c66975f54

Original change: https://android-review.googlesource.com/c/platform/art/+/2980971

Change-Id: I65db37b233eac68a19782d63b607503837a71c27
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>