PeerKey: Fix STK 4-way handshake regression

Commit c93b7e18885b07bf198e230019185b50ed622d9f ('RSN: Check result of
EAPOL-Key frame send request') forgot to update two PeerKey users of
EAPOL-Key TX functions. That resulted in STK handshake failing since
message 2/4 and 4/4 TX calls were assumed to have failed when the return
value was changed from 0 to a positive value for success case. This
resulted in not updating nonce information properly and hitting
following error when processing STK 4-way handshake message 3/4:

RSN: INonce from message 1 of STK 4-Way Handshake differs from 3 of STK
4-Way Handshake - drop packet (src=<addr>)

Signed-off-by: Jouni Malinen <j@w1.fi>

src/rsn_supp/peerkey.c

@@ -715,7 +715,8 @@ static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm,
 
 	if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver,
 				       peerkey->pnonce, kde_buf, kde_buf_len,
-				       stk)) {
+				       stk) < 0) {
+		wpa_printf(MSG_INFO, "RSN: Failed to send STK message 2/4");
 		os_free(kde_buf);
 		return;
 	}
@@ -854,8 +855,10 @@ static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm,
 
 	if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver,
 				       WPA_GET_BE16(key->key_info),
-				       &peerkey->stk))
+				       &peerkey->stk) < 0) {
+		wpa_printf(MSG_INFO, "RSN: Failed to send STK message 4/4");
 		return;
+	}
 
 	_key = peerkey->stk.tk;
 	if (peerkey->cipher == WPA_CIPHER_TKIP) {