progressbar: set_progressbar_state() can be called by threads killed

when restoring the filesystem, due to this we must ensure
the mutex is cleanly released.

Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
1 file changed
tree: cc4ac621dcb97e57f8f3d63593fddf17b32a09be
  1. kernel/
  2. kernel-2.4/
  3. squashfs-tools/
  4. README