share_pool: Fix missing semaphore operation in error branch

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4EUVI
CVE: NA

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Increase the value of sp_stat_sem when failed.
Signed-off-by: NTang Yizhou <tangyizhou@huawei.com>
Reviewed-by: NDing Tianhong <dingtianhong@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

mm/share_pool.c

@@ -135,6 +135,7 @@ static struct sp_proc_stat *sp_init_proc_stat(struct task_struct *tsk,
 			up_write(&sp_stat_sem);
 			return stat;
 		} else {
+			up_write(&sp_stat_sem);
 			/* if enter this branch, that's our mistake */
 			pr_err_ratelimited("share pool: proc stat invalid id %d\n", id);
 			return ERR_PTR(-EBUSY);