change usbd_init() return to bool for simplicity

src/tusb.h

@@ -101,16 +101,14 @@
 /** \ingroup group_application_api
  *  @{ */
 
-/** \brief Initialize the usb stack
- * \return Error Code of the \ref TUSB_ERROR enum
- * \note   Function will initialize the stack according to configuration in the configure file (tusb_config.h)
- */
-tusb_error_t tusb_init(void);
+// Initialize device/host stack according to tusb_config.h
+// return true if success
+bool tusb_init(void);
 
 #if CFG_TUSB_OS == OPT_OS_NONE
 /** \brief Run all tinyusb's internal tasks (e.g host task, device task).
  * \note   This function is only required when using no RTOS (\ref CFG_TUSB_OS == OPT_OS_NONE). All the stack functions
- *         & callback are invoked within this function, so it should be called periodically within the mainloop
+ *         & callback are invoked within this function. This should be called periodically within the mainloop
  *
     @code
     int main(void)