AP_InertialSensor: updates for AP_HAL::MemberProc

libraries/AP_InertialSensor/AP_InertialSensor_MPU6000.cpp

@@ -228,7 +228,7 @@ uint16_t AP_InertialSensor_MPU6000::_init_sensor( Sample_rate sample_rate )
     _read_data_transaction();
 
     // start the timer process to read samples
-    hal.scheduler->register_timer_process(reinterpret_cast<AP_HAL::TimedProc>(&AP_InertialSensor_MPU6000::_poll_data), this);
+    hal.scheduler->register_timer_process(AP_HAL_MEMBERPROC(&AP_InertialSensor_MPU6000::_poll_data));
 
 #if MPU6000_DEBUG
     _dump_registers();