cifs: fix potential null pointer use in destroy_workqueue in init_cifs error path

Dan Carpenter reported a Smack static checker warning:
fs/smb/client/cifsfs.c:1981 init_cifs()
error: we previously assumed 'serverclose_wq' could be null (see line 1895)

The patch which introduced the serverclose workqueue used the wrong
oredering in error paths in init_cifs() for freeing it on errors.

Fixes: 173217bd7336 ("smb3: retrying on failed server close")
Cc: [e-mail]
Cc: Ritvik Budhiraja <[e-mail]>
Reported-by: Dan Carpenter <[e-mail]>
Reviewed-by: Dan Carpenter <[e-mail]>
Reviewed-by: David Howells <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/smb/client/cifsfs.c

···
 					   WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
 	if (!serverclose_wq) {
 		rc = -ENOMEM;
-		goto out_destroy_serverclose_wq;
+		goto out_destroy_deferredclose_wq;
 	}
 
 	rc = cifs_init_inodecache();
 	if (rc)
-		goto out_destroy_deferredclose_wq;
+		goto out_destroy_serverclose_wq;
 
 	rc = cifs_init_netfs();
 	if (rc)
···
 	cifs_destroy_netfs();
 out_destroy_inodecache:
 	cifs_destroy_inodecache();
+out_destroy_serverclose_wq:
+	destroy_workqueue(serverclose_wq);
 out_destroy_deferredclose_wq:
 	destroy_workqueue(deferredclose_wq);
 out_destroy_cifsoplockd_wq:
···
 	destroy_workqueue(decrypt_wq);
 out_destroy_cifsiod_wq:
 	destroy_workqueue(cifsiod_wq);
-out_destroy_serverclose_wq:
-	destroy_workqueue(serverclose_wq);
 out_clean_proc:
 	cifs_proc_clean();
 	return rc;