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

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

Change-Id: I0118a2354fc5674a0eebadeeb51ee563d62f50b8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>