Before this change file handles could get closed while the truncate
the file handles loop was running.
This would mean that ocassionally an ECLOSED (which is translated into
EBADF by cmd/mount) would spuriously be returned if Release happened
to happen in the middle of a Truncate call (Setattr called with
size=0).
This change ignores the ECLOSED while truncating file handles.
See: https://forum.rclone.org/t/writes-to-wasabi-mount-failing-with-bad-file-descriptor-intermittently/26321
Nick Craig-Wood
0902e5c48e