eth: mtk_ppe: fix up after merge

I missed this in the barrage of GCC 12 warnings. Commit cf2df74e
("net: fix dev_fill_forward_path with pppoe + bridge") changed
the pointer into an array.

Fixes: d7e6f583 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
Link: https://lore.kernel.org/r/20220520012555.2262461-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mediatek/mtk_ppe_offload.c

@@ -90,10 +90,11 @@ mtk_flow_get_wdma_info(struct net_device *dev, const u8 *addr, struct mtk_wdma_i
 {
 	struct net_device_path_ctx ctx = {
 		.dev = dev,
-		.daddr = addr,
 	};
 	struct net_device_path path = {};
 
+	memcpy(ctx.daddr, addr, sizeof(ctx.daddr));
+
 	if (!IS_ENABLED(CONFIG_NET_MEDIATEK_SOC_WED))
 		return -1;