ifndef HAL_USE_USB_MSD compilation fix

firmware/hw_layer/mass_storage/usb_msd_cfg.c

@@ -19,6 +19,8 @@
 #include "hal_usb_msd.h"
 #include "usb_msd_cfg.h"
 
+#if HAL_USE_USB_MSD
+
 /*
  * must be 64 for full speed and 512 for high speed
  */
@@ -228,3 +230,4 @@ const USBConfig msdusbcfg = {
   NULL
 };
 
+#endif /* HAL_USE_USB_MSD */

firmware/hw_layer/mmc_card.cpp

@@ -54,10 +54,11 @@ EXTERN_ENGINE;
 
 extern board_configuration_s *boardConfiguration;
 
+#if HAL_USE_USB_MSD
 //static USBDriver *ms_usb_driver = &USBD1;
 //static USBMassStorageDriver UMSD1;
 extern const USBConfig msdusbcfg;
-
+#endif /* HAL_USE_USB_MSD */
 
 
 #define PUSHPULLDELAY 500