Apply #pragma once, misc cleanup (#12322)

* Apply #pragma once in headers
* Adjust some thermistors formatting
* Misc cleanup and formatting

Marlin/src/feature/leds/blinkm.h

@@ -19,17 +19,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * blinkm.h - Control a BlinkM over i2c
  */
 
-#ifndef _BLINKM_H_
-#define _BLINKM_H_
-
 struct LEDColor;
 typedef LEDColor LEDColor;
 
 void blinkm_set_led_color(const LEDColor &color);
-
-#endif // _BLINKM_H_

Marlin/src/feature/leds/neopixel.h

@@ -19,14 +19,12 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Neopixel support
  */
 
-#ifndef __NEOPIXEL_H__
-#define __NEOPIXEL_H__
-
 #include "../../inc/MarlinConfig.h"
 
 #include <Adafruit_NeoPixel.h>
@@ -46,5 +44,3 @@ void set_neopixel_color(const uint32_t color);
 //bool neopixel_set_led_color(const uint8_t r, const uint8_t g, const uint8_t b, const uint8_t w, const uint8_t p);
 
 extern Adafruit_NeoPixel pixels;
-
-#endif // __NEOPIXEL_H__

Marlin/src/feature/leds/pca9632.h

@@ -19,18 +19,14 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Driver for the Philips PCA9632 LED driver.
  * Written by Robert Mendon Feb 2017.
  */
 
-#ifndef __PCA9632_H__
-#define __PCA9632_H__
-
 struct LEDColor;
 typedef LEDColor LEDColor;
 
 void pca9632_set_led_color(const LEDColor &color);
-
-#endif // __PCA9632_H__

Marlin/src/feature/leds/tempstat.h

@@ -19,14 +19,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Marlin general RGB LED support
  */
 
-#ifndef __TEMPSTAT_H__
-#define __TEMPSTAT_H__
-
 void handle_status_leds(void);
-
-#endif // __TEMPSTAT_H__