the nullptr update

src/main.c

@@ -83,7 +83,7 @@ static void *sensors_thread(void *arg) {
 
 	aio_close(&sensors->aio);
 	applog(LOG_WRN, "sensors thread stopped");
-	return NULL;
+	return nullptr;
 }
 
 static void *display_thread(void *arg) {
@@ -168,7 +168,7 @@ static void *display_thread(void *arg) {
 	lcd_flush_buf(&lcd);
 	lcd_close(&lcd);
 	applog(LOG_WRN, "display thread stopped");
-	return NULL;
+	return nullptr;
 }
 
 int main(void) {
@@ -181,7 +181,7 @@ int main(void) {
 
 	/* malloc memory for the struct */
 	struct sensors_t *sensors = malloc(sizeof(*sensors)); // no actual point in mallocing and it is ever so sligtly slower to access heap vs stack, but its cool
-	if (sensors == NULL) {
+	if (sensors == nullptr) {
 		applog(LOG_ERR, "can't allocate mem for the sensor struct. You don't got %lu bytes bro?", sizeof(*sensors));
 		return 1;
 	}