NTFS: Fix cluster (de)allocators to work when the runlist is NULL and more

      importantly to take a locked runlist rather than them locking it
      which leads to lock reversal.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

diff --cc fs/ntfs/ChangeLog
Simple merge

diff --cc fs/ntfs/lcnalloc.c
Simple merge

diff --cc fs/ntfs/lcnalloc.h
Simple merge

diff --cc fs/ntfs/mft.c
Simple merge