bug in usePin()

[rob040]

in function usePin the member variable dmxPin is set to argument var pin, before it is tested for unequality; the next if test will always be false:

void DmxMasterClass::usePin(uint8_t pin) {
  dmxPin = pin;
  if (dmxStarted && (pin != dmxPin)) {
    dmxEnd();
    dmxBegin();
  }
}

Solution is of course test-before-set:

void DmxMasterClass::usePin(uint8_t pin) {
  if (pin != dmxPin) {
    dmxPin = pin;
    if (dmxStarted) {
      dmxEnd();
      dmxBegin();
    }
  }
}