Coding style and add State field init

Author: bcostm

targets/TARGET_STM/TARGET_STM32F2/analogout_device.c

@@ -35,7 +35,8 @@
 #include "mbed_error.h"
 #include "PeripheralPins.h"
 
-void analogout_init(dac_t *obj, PinName pin) {
+void analogout_init(dac_t *obj, PinName pin)
+{
     DAC_ChannelConfTypeDef sConfig = {0};
 
     // Get the peripheral name from the pin and assign it to the object
@@ -71,6 +72,8 @@ void analogout_init(dac_t *obj, PinName pin) {
 
     // Configure DAC
     obj->handle.Instance = (DAC_TypeDef *)(obj->dac);
+    obj->handle.State = HAL_DAC_STATE_RESET;
+
     if (HAL_DAC_Init(&obj->handle) != HAL_OK ) {
         error("HAL_DAC_Init failed");
     }