net: microchip: vcap: use kmemdup() to allocate memory

Use kmemdup() helper instead of open-coding to simplify
the code when allocating newckf and newcaf.

Generated by: scripts/coccinelle/api/memdup.cocci

Signed-off-by: Yang Yingliang <[e-mail]>
Reviewed-by: Jesse Brandeburg <[e-mail]>
Reviewed-by: Steen Hegelund <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/microchip/vcap/vcap_api.c

···
 		return duprule;
 
 	list_for_each_entry(ckf, &ri->data.keyfields, ctrl.list) {
-		newckf = kzalloc(sizeof(*newckf), GFP_KERNEL);
+		newckf = kmemdup(ckf, sizeof(*newckf), GFP_KERNEL);
 		if (!newckf)
 			return ERR_PTR(-ENOMEM);
-		memcpy(newckf, ckf, sizeof(*newckf));
 		list_add_tail(&newckf->ctrl.list, &duprule->data.keyfields);
 	}
 
 	list_for_each_entry(caf, &ri->data.actionfields, ctrl.list) {
-		newcaf = kzalloc(sizeof(*newcaf), GFP_KERNEL);
+		newcaf = kmemdup(caf, sizeof(*newcaf), GFP_KERNEL);
 		if (!newcaf)
 			return ERR_PTR(-ENOMEM);
-		memcpy(newcaf, caf, sizeof(*newcaf));
 		list_add_tail(&newcaf->ctrl.list, &duprule->data.actionfields);
 	}