Remove useless high-volume printf (fixes #1544).

src/net.cpp

@@ -938,8 +938,6 @@ void ThreadSocketHandler2(void* parg)
                                 pnode->CloseSocketDisconnect();
                             }
                         }
-                        if (vSend.size() > SendBufferSize())
-                            printf("socket send buffer full warning (%d bytes)\n", vSend.size());
                     }
                 }
             }