afs: remove unnecessary dentry_unhash on rmdir, dir rename
afs has no problems with references to unlinked directories. CC: David Howells <dhowells@redhat.com> CC: linux-afs@lists.infradead.org Signed-off-by: NSage Weil <sage@newdream.net> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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