Merge pull request arduino#2618 from ffissore/fix-ethernetclient-boolean-comparison

EthernetClient == and != operators

Author: ffissore

libraries/Ethernet/src/EthernetClient.h

@@ -24,6 +24,8 @@ class EthernetClient : public Client {
   virtual void stop();
   virtual uint8_t connected();
   virtual operator bool();
+  virtual bool operator==(const bool value) { return bool() == value; }
+  virtual bool operator!=(const bool value) { return bool() != value; }
   virtual bool operator==(const EthernetClient&);
   virtual bool operator!=(const EthernetClient& rhs) { return !this->operator==(rhs); };