wifi: cw1200: use get_unaligned_le64()

Instead of the code here that copies into a variable
first and then flips endianness, which confuses sparse,
just directly use get_unaligned_le64().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220904212910.a5c9ea122f0f.If786a66f8fd9d45659cd5a2532cf395e21334453@changeid

drivers/net/wireless/st/cw1200/txrx.c

@@ -1142,8 +1142,7 @@ void cw1200_rx_cb(struct cw1200_common *priv,
 
 	/* Remove TSF from the end of frame */
 	if (arg->flags & WSM_RX_STATUS_TSF_INCLUDED) {
-		memcpy(&hdr->mactime, skb->data + skb->len - 8, 8);
-		hdr->mactime = le64_to_cpu(hdr->mactime);
+		hdr->mactime = get_unaligned_le64(skb->data + skb->len - 8);
 		if (skb->len >= 8)
 			skb_trim(skb, skb->len - 8);
 	} else {