aft: Avoid stale pointer pointer reference.

aft: Avoid stale pointer pointer reference.

We can't rely on the ->hash and ->path pointers of struct
status_item_ls_data because they both become stale when the audio
file table gets remapped. This happens for example when a new audio
file is added while another audio file is currently open. A subsequent
addblob command then triggers a re-initialization of the status items,
which reads from the stale pointer location.

This usually results in garbage in the stat output, but can also lead
to a segfault or worse. Avoid this from happening by creating a copy
of the hash and the path.

This bug has been present for a long time. It was hard to debug
because often no invalid memory accesses occur, hence valgrind does
not complain.