ethernet: remove disconnect overload

Author: pennam

libraries/Ethernet/src/Ethernet.cpp

@@ -67,10 +67,6 @@ EthernetHardwareStatus EthernetClass::hardwareStatus() {
 	}
 }
 
-int EthernetClass::disconnect() {
-	return NetworkInterface::disconnect();
-}
-
 void EthernetClass::end() {
 	disconnect();
 }

libraries/Ethernet/src/Ethernet.h

@@ -53,8 +53,6 @@ class EthernetClass : public NetworkInterface {
 	}
 
 	void init(uint8_t sspin = 10);
-
-	int disconnect(void);
 	void end(void);
 
 	IPAddress localIP();