1775 1631's fix missed the case of data on the handshake's ACK

*** 3747,3756 ****
--- 3747,3763 ----
                                  ASSERT(TCP_IS_DETACHED(tcp));
                                  (void) tcp_close_detached(tcp);
                                  return;
                          }
                          /*
+                          * tcp_newconn_notify() changes conn_upcalls and
+                          * connp->conn_upper_handle.  Fix things now, in case
+                          * there's data attached to this ack.
+                          */
+                         if (connp->conn_upcalls != NULL)
+                                 sockupcalls = connp->conn_upcalls;
+                         /*
                           * For passive open, trace receipt of final ACK as
                           * tcp:::accept-established.
                           */
                          DTRACE_TCP5(accept__established, mlbk_t *, NULL,
                              ip_xmit_attr_t *, connp->conn_ixa, void_ip_t *,