NTFS: Change ntfs_attr_find_vcn_nolock() to also take an optional attribute

      search context as argument.  This allows calling it with the mft
      record mapped.  Update all callers.

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

diff --cc fs/ntfs/ChangeLog
Simple merge

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

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

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

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