AP_HAL_ChibiOS: fix CAN manager initialization

libraries/AP_HAL_ChibiOS/CAN.cpp

@@ -43,11 +43,7 @@ uavcan::MonotonicTime clock::getMonotonic()
 
 bool CANManager::begin(uint32_t bitrate, uint8_t can_number)
 {
-    if (can_helper.init(bitrate, CanIface::OperatingMode::NormalMode, can_number) == 0) {
+    return (can_helper.init(bitrate, CanIface::OperatingMode::NormalMode, can_number) == 0);
-        bitrate_ = bitrate;
-        initialized_ = true;
-    }
-    return initialized_;
 }
 
 bool CANManager::is_initialized()

libraries/AP_HAL_ChibiOS/CAN.h

@@ -74,7 +74,6 @@ public:
 private:
     AP_UAVCAN *p_uavcan;
     bool initialized_;
-    uint32_t bitrate_;
     uavcan_stm32::CanInitHelper<CAN_STM32_RX_QUEUE_SIZE> can_helper;
 };