fixed copy paste errors

Author: chrJost

targets/TARGET_STM/TARGET_STM32L5/system_clock.c

@@ -180,14 +180,14 @@ uint8_t SetSysClock_PLL_MSI(void)
 #if DEVICE_TRNG
     PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RNG;
     PeriphClkInitStruct.RngClockSelection = RCC_RNGCLKSOURCE_HSI48;
-    if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
+    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
         return 0; // FAIL
     }
 #endif
 #if DEVICE_USBDEVICE
-    RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
-    RCC_PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
-    if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
+    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
+    PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
+    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
         return 0; // FAIL
     }
 #endif