fix step motor bug

sdk/components/step_motor_ctrl_module/step_motor_ctrl_module.cpp

@@ -233,9 +233,10 @@ void StepMotorCtrlModule::after_motor_move() {
   m_state.dpos = m_state.after_move_pos - m_state.before_move_pos;
   if (creg.module_errorcode != 0) {
     creg.module_status = 2;
-  }
+  } else {
     creg.module_status = 0;
   }
+}
 
 void StepMotorCtrlModule::dumpTMC5130Status(TMC51X0::DevStatusReg_t* status) {
   ZLOGI(TAG, "------------ dump TMC51X0 DevStatusReg_t ---------------");