nfsd4: destroy_clientid simplification

I'm not sure what the check for clientid expiry was meant to do here.

The check for a matching session is redundant given the previous check
for state: a client without state is, in particular, a client without
sessions.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 84dfbdf..905a5b5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2131,13 +2131,7 @@
 	if (conf) {
 		clp = conf;
 
-		if (!is_client_expired(conf) && client_has_state(conf)) {
-			status = nfserr_clientid_busy;
-			goto out;
-		}
-
-		/* rfc5661 18.50.3 */
-		if (cstate->session && conf == cstate->session->se_client) {
+		if (client_has_state(conf)) {
 			status = nfserr_clientid_busy;
 			goto out;
 		}