fix hang at I2P error

i2psam.cpp

@@ -310,6 +310,7 @@ RequestResult<std::auto_ptr<Socket> > StreamSession::accept(bool silent)
     case Message::EMPTY_ANSWER:
     case Message::CLOSED_SOCKET:
     case Message::INVALID_ID:
+    case Message::I2P_ERROR:
         fallSick();
         break;
     default:
@@ -331,6 +332,7 @@ RequestResult<std::auto_ptr<Socket> > StreamSession::connect(const std::string&
     case Message::EMPTY_ANSWER:
     case Message::CLOSED_SOCKET:
     case Message::INVALID_ID:
+    case Message::I2P_ERROR:
         fallSick();
         break;
     default:
@@ -354,6 +356,7 @@ RequestResult<void> StreamSession::forward(const std::string& host, uint16_t por
     case Message::EMPTY_ANSWER:
     case Message::CLOSED_SOCKET:
     case Message::INVALID_ID:
+    case Message::I2P_ERROR:
         fallSick();
         break;
     default:

i2psam.h

@@ -22,6 +22,7 @@
 #include <arpa/inet.h>      // for ntohs and htons
 #endif
 
+// TODO: check a possible bug about cast -1 to SOCKET
 #define SAM_INVALID_SOCKET      (-1)
 #define SAM_SOCKET_ERROR        (-1)