omfs: merge unlink() and rmdir(), close leak in rename()

In case of directory-overwriting rename(), omfs forgot to mark the
victim doomed, so omfs_evict_inode() didn't free it.

We could fix that by calling omfs_rmdir() for directory victims
instead of doing omfs_unlink(), but it's easier to merge omfs_unlink()
and omfs_rmdir() instead.  Note that we have no hardlinks here.

It also makes the checks in omfs_rename() go away - they fold into
what omfs_remove() does when it runs into a directory.

Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Bob Copeland <[email protected]>

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