Only updates the supplied deviceAddress if a valid index is specified

Author: mitchyboy9

DallasTemperature.cpp

@@ -152,19 +152,19 @@ bool DallasTemperature::validAddress(const uint8_t* deviceAddress) {
 // finds an address at a given index on the bus
 // returns true if the device was found
 bool DallasTemperature::getAddress(uint8_t* deviceAddress, uint8_t index) {
+	if (index < devices) {
+		uint8_t depth = 0;
 
-	uint8_t depth = 0;
+		_wire->reset_search();
 
-	_wire->reset_search();
-
-	while (depth <= index && _wire->search(deviceAddress)) {
-		if (depth == index && validAddress(deviceAddress))
-			return true;
-		depth++;
+		while (depth <= index && _wire->search(deviceAddress)) {
+			if (depth == index && validAddress(deviceAddress))
+				return true;
+			depth++;
+		}
 	}
 
 	return false;
-
 }
 
 // attempt to determine if the device at the given address is connected to the bus