cgroup: Fix clone_flags drop error in fork_with_pid

The commit dae14ddf does not drop the CLONE_NEWCGROUP correctly.
Thsi patch fix it.
Signed-off-by: Wang Long <long.wanglong@huawei.com>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-restore.c

@@ -1291,7 +1291,7 @@ static inline int fork_with_pid(struct pstree_item *item)
 	 * move_in_cgroup(), so drop this flag here as well.
 	 */
 	ret = clone(restore_task_with_children, ca.stack_ptr,
-		    (ca.clone_flags & (~CLONE_NEWNET | ~CLONE_NEWCGROUP)) | SIGCHLD, &ca);
+		    (ca.clone_flags & ~(CLONE_NEWNET | CLONE_NEWCGROUP)) | SIGCHLD, &ca);
 
 	if (ret < 0) {
 		pr_perror("Can't fork for %d", pid);