TDLS: Clean up os_memcmp use

Ciuple of the nonce comparisons used a strange '!os_memcmp() == 0' to
check if the values were different. While this resulted in correct
behavior, the construction is not exactly clear and clang has started
warning about this (-Wlogical-not-parentheses). Clean this up by using
'os_mecmp() != 0'.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/rsn_supp/tdls.c

@@ -2339,7 +2339,7 @@ static int wpa_tdls_process_tpk_m2(struct wpa_sm *sm, const u8 *src_addr,
 		    kde.ftie, sizeof(*ftie));
 	ftie = (struct wpa_tdls_ftie *) kde.ftie;
 
-	if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
+	if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
 		wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M2 does "
 			   "not match with FTIE SNonce used in TPK M1");
 		/* Silently discard the frame */
@@ -2518,13 +2518,13 @@ static int wpa_tdls_process_tpk_m3(struct wpa_sm *sm, const u8 *src_addr,
 		goto error;
 	}
 
-	if (!os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) == 0) {
+	if (os_memcmp(peer->rnonce, ftie->Anonce, WPA_NONCE_LEN) != 0) {
 		wpa_printf(MSG_INFO, "TDLS: FTIE ANonce in TPK M3 does "
 			   "not match with FTIE ANonce used in TPK M2");
 		goto error;
 	}
 
-	if (!os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) == 0) {
+	if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
 		wpa_printf(MSG_INFO, "TDLS: FTIE SNonce in TPK M3 does not "
 			   "match with FTIE SNonce used in TPK M1");
 		goto error;