Commented out unnecessary variable

Author: DannyCato

src/core/platform/f4xx/stm32f446xx.cpp

@@ -11,7 +11,7 @@ void stm32f4xx_init() {
     HAL_Init();
     RCC_OscInitTypeDef RCC_OscInitStruct   = {0};
     RCC_ClkInitTypeDef RCC_ClkInitStruct   = {0};
-    RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
+    // RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
     /** Configure the main internal regulator output voltage
      */