libfmq: Improve error logging am: a78c0d2b53 am: 2b1b9c648a

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/libfmq/+/11842976

Change-Id: I06c4e34f5020580bbe8902e5267c0f6a00a64f7e