arm64/mpam: fix a memleak in add_schema

openEuler inclusion
category: bugfix
bugzilla: 48265
CVE: NA
Reference: https://gitee.com/openeuler/kernel/issues/I3BPPX

---------------------------------------------------

The default branch in switch will not run at present,
but there may be related extensions in the future,
which may lead to memory leakage.

Signed-off-by: Zhang Ming <154842638(a)qq.com>
Reported-by: Wang ShaoBo <bobo.shaobowang(a)huawei.com>
Suggested-by: Jian Cheng <cj.chengjian(a)huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
[Zheng Zengkai: adjust commit message]
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/kernel/mpam/mpam_ctrlmon.c

@@ -74,6 +74,7 @@ static int add_schema(enum resctrl_conf_type t, struct resctrl_resource *r)
 		suffix = "";
 		break;
 	default:
+		kfree(s);
 		return -EINVAL;
 	}