IEEE1394(r1173): Small change to csr1212 prevent possible kernel panics from...

IEEE1394(r1173): Small change to csr1212 prevent possible kernel panics from improper directory parsing.

drivers/ieee1394/csr1212.c

@@ -704,11 +704,12 @@ void _csr1212_destroy_keyval(struct csr1212_keyval *kv)
 			if (k->key.type == CSR1212_KV_TYPE_DIRECTORY) {
 				/* If the current entry is a directory, then move all
 				 * the entries to the destruction list. */
+				if (k->value.directory.dentries_head) {
 					tail->next = k->value.directory.dentries_head;
-				if (k->value.directory.dentries_head)
 					k->value.directory.dentries_head->prev = tail;
 					tail = k->value.directory.dentries_tail;
                                 }
+			}
 			free_keyval(k);
 			k = a;
 		}