FT: Fix RRB messages to use correct endianness

The pairwise cipher field is supposed to be little endian, but the
message building functions did not swap the bytes on big endian
hosts while the message processing functions did. Fix this by using
little endian byte order in both places.

src/ap/wpa_auth_ft.c

@@ -1431,7 +1431,7 @@ static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
 	wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
 	wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
 		    WPA_PMK_NAME_LEN);
-	r.pairwise = pairwise;
+	r.pairwise = host_to_le16(pairwise);
 
 	if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
 		     r.nonce, resp.nonce) < 0) {
@@ -1734,7 +1734,7 @@ static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
 		    WPA_PMK_NAME_LEN);
 	os_get_time(&now);
 	WPA_PUT_LE32(f.timestamp, now.sec);
-	f.pairwise = pairwise;
+	f.pairwise = host_to_le16(pairwise);
 	if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
 		     f.timestamp, frame.timestamp) < 0)
 		return;