fixed incorrect node-id distance calculation in DHT

ChangeLog

@@ -1,3 +1,4 @@
+	* Fixed invalid calculation in DHT node distance
 	* Fixed bug in URL parser that failed to parse IPv6 addresses
 	* added peer download rate approximation
 	* added port filter for outgoing connection (to prevent

src/kademlia/node_id.cpp

@@ -87,7 +87,7 @@ int distance_exp(node_id const& n1, node_id const& n2)
 		// return the bit-number of the first bit
 		// that differs
 		int bit = byte * 8;
-		for (int b = 7; b > 0; --b)
+		for (int b = 7; b >= 0; --b)
 			if (t >= (1 << b)) return bit + b;
 		return bit;
 	}