nfsd: only unhash DRC entries that are in the hashtable
It's not safe to call hlist_del() on a newly initialized hlist_node. That leads to a NULL pointer dereference. Only do that if the entry is hashed. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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