Merge branch 'refs/heads/t/stale-pointer-fix'

This bug only triggered if the kernel changes the address of the memory
mapping of the audio file table after a file was added, and a subsequent
operation would access the then stale pointer.

Cooking for a week.

* refs/heads/t/stale-pointer-fix:
  Don't use strdup() to copy hash.
  aft: Avoid stale pointer pointer reference.