Check os_snprintf() result more consistently - success case

This converts os_snprintf() result validation cases to use
os_snprintf_error() in cases where success condition was used to execute
a step. These changes were done automatically with spatch using the
following semantic patch:

@@
expression E1,E2,E3;
statement S1;
@@

  E1 = os_snprintf(E2, E3, ...);
- if (\( E1 >= 0 \| E1 > 0 \) && \( (size_t) E1 < E3 \| E1 < (int) E3 \| E1 < E3 \))
+ if (!os_snprintf_error(E3, E1))
  S1

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

src/ap/wps_hostapd.c

@@ -185,7 +185,7 @@ static void hostapd_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
 			  dev->model_number, dev->serial_number,
 			  wps_dev_type_bin2str(dev->pri_dev_type, devtype,
 					       sizeof(devtype)));
-	if (len > 0 && len < (int) sizeof(txt))
+	if (!os_snprintf_error(sizeof(txt), len))
 		wpa_msg(hapd->msg_ctx, MSG_INFO, "%s", txt);
 
 	if (hapd->conf->wps_pin_requests) {