get rid of assorted nameidata-related debris

pointless forward declarations, stale comments

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/9p/vfs_inode.c
Simple merge

diff --cc fs/9p/vfs_inode_dotl.c
Simple merge

diff --cc fs/ecryptfs/inode.c
Simple merge

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

diff --cc include/linux/fs.h
Simple merge

diff --cc include/linux/namei.h
Simple merge

diff --cc include/linux/sched.h
Simple merge