Fix LED pin enum

* Fix LED pin enum, first one should start at 1
* Fix LED initialization typo

stm/led.c

@@ -63,8 +63,8 @@ void led_init(void) {
     /* Turn off LEDs */
     PYB_LED_OFF(PYB_LED1_PORT, PYB_LED1_PIN);
     PYB_LED_OFF(PYB_LED2_PORT, PYB_LED2_PIN);
-    PYB_LED_OFF(PYB_LED3_PORT, PYB_LED1_PIN);
-    PYB_LED_OFF(PYB_LED4_PORT, PYB_LED2_PIN);
+    PYB_LED_OFF(PYB_LED3_PORT, PYB_LED3_PIN);
+    PYB_LED_OFF(PYB_LED4_PORT, PYB_LED4_PIN);
 
     /* Initialize LEDs */
     GPIO_InitStructure.GPIO_Pin = PYB_LED1_PIN;

stm/led.h

 typedef enum {
-    PYB_LED_R1 = 0,
-    PYB_LED_R2 = 1,
-    PYB_LED_G1 = 2,
-    PYB_LED_G2 = 3,
+    PYB_LED_R1 = 1,
+    PYB_LED_R2 = 2,
+    PYB_LED_G1 = 3,
+    PYB_LED_G2 = 4,
     //STM32F4DISC
-    PYB_LED_R = 0,
-    PYB_LED_G = 1,
-    PYB_LED_B = 2,
-    PYB_LED_O = 3,
+    PYB_LED_R = 1,
+    PYB_LED_G = 2,
+    PYB_LED_B = 3,
+    PYB_LED_O = 4,
 } pyb_led_t;
 
 void led_init(void);