Properly clear ntp timeinfo struct

main/ntp.cpp

@@ -24,7 +24,8 @@ static ntpd_parameter_t parameter;
 
 void ntp_task(void *ignored) {
     time_t now = 0;
-    struct tm timeinfo = { 0 };
+    struct tm timeinfo;
+    memset(&timeinfo, 0, sizeof(tm));
 
     ESP_LOGI(TAG, "Configuring ntp");
     sntp_setoperatingmode(SNTP_OPMODE_POLL);