wifi: iwlegacy: avoid fortify warning

There are two different alive messages, the "init" one is
bigger than the other one, so we have a fortify read warn
here. Avoid it by copying from the variable-sized 'raw'
instead.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230216203444.134310-1-johannes@sipsolutions.net

drivers/net/wireless/intel/iwlegacy/4965-mac.c

@@ -4020,7 +4020,7 @@ il4965_hdl_alive(struct il_priv *il, struct il_rx_buf *rxb)
 
 	if (palive->ver_subtype == INITIALIZE_SUBTYPE) {
 		D_INFO("Initialization Alive received.\n");
-		memcpy(&il->card_alive_init, &pkt->u.alive_frame,
+		memcpy(&il->card_alive_init, &pkt->u.raw,
 		       sizeof(struct il_init_alive_resp));
 		pwork = &il->init_alive_start;
 	} else {