net/sched: act_pedit: Use kmemdup() to replace kmalloc + memcpy

./net/sched/act_pedit.c:245:21-28: WARNING opportunity for kmemdup.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=5478
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/act_pedit.c

@@ -242,14 +242,12 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 	nparms->tcfp_flags = parm->flags;
 	nparms->tcfp_nkeys = parm->nkeys;
 
-	nparms->tcfp_keys = kmalloc(ksize, GFP_KERNEL);
+	nparms->tcfp_keys = kmemdup(parm->keys, ksize, GFP_KERNEL);
 	if (!nparms->tcfp_keys) {
 		ret = -ENOMEM;
 		goto put_chain;
 	}
 
-	memcpy(nparms->tcfp_keys, parm->keys, ksize);
-
 	for (i = 0; i < nparms->tcfp_nkeys; ++i) {
 		u32 offmask = nparms->tcfp_keys[i].offmask;
 		u32 cur = nparms->tcfp_keys[i].off;