fr::TcpSocket bug fix

Recv's return value was being checked to see if it was greater or equal to 0, if everything was okay. 0 indicates connection closed, and so the socket should have disconnected instead of returning Success.

src/TcpSocket.cpp

@@ -55,7 +55,7 @@ namespace fr
         //Read RECV_CHUNK_SIZE bytes into the recv buffer
 		int64_t status = ::recv(socket_descriptor, (char*)data, buffer_size, 0);
 
-        if(status >= 0)
+        if(status > 0)
         {
             received += status;
         }