kill find_inode_number()

the only remaining caller (in ncpfs) is guaranteed to return 0 -
we only hit it if we'd just checked that there's no dentry with
such name.

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

diff --cc fs/dcache.c
Simple merge

diff --cc fs/ncpfs/dir.c
Simple merge

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