Return on setAddress if nodeID is non-zero (#255)

* Return on setAddress if nodeID is non-zero

Fixes nRF24/RF24Gateway#28

Co-authored-by: Brendan <2bndy5@gmail.com>

---------

Co-authored-by: Brendan <2bndy5@gmail.com>

Author: TMRh20

RF24Mesh.cpp

@@ -472,6 +472,11 @@ void ESBMesh<network_t, radio_t>::setStaticAddress(uint8_t nodeID, uint16_t addr
 template<class network_t, class radio_t>
 void ESBMesh<network_t, radio_t>::setAddress(uint8_t nodeID, uint16_t address, bool searchBy)
 {
+
+    if (_nodeID) {
+        return;
+    }
+
     //Look for the node in the list
     for (uint8_t i = 0; i < addrListTop; i++) {
         if (searchBy == false) {