fix(example): Fix compilation errors

Author: P-R-O-C-H-Y

libraries/Zigbee/examples/Zigbee_Multistate_Input_Output/Zigbee_Multistate_Input_Output.ino

@@ -65,7 +65,7 @@ void onStateChangeCustom(uint16_t state) {
  // print the state
  Serial.printf("Received state change: %d\r\n", state);
  // print the state name using the stored state names
- if (multistate_custom_state_names && state < zbMultistateDeviceCustom.getMultistateOutputStateNamesLength()) {
+ if (state < zbMultistateDeviceCustom.getMultistateOutputStateNamesLength()) {
  Serial.printf("State name: %s\r\n", multistate_custom_state_names[state]);
  }
  // print state index of possible options
@@ -161,8 +161,6 @@ void setup() {
 }
 
 void loop() {
- static uint32_t timeCounter = 0;
-
  // Checking button for factory reset and reporting
  if (digitalRead(button) == LOW) { // Push button pressed
  // Key debounce handling