Make port close not be delayed

Drivers are dereferenced when the port is completely gone, in the operation
scheduled with erts_schedule_thr_prgr_later_op. If we use
erts_schedule_thr_prgr_later_cleanup_op, it may not happen
for a long time and the driver can not be unloaded.

We can not dereference the driver before the thread_progress_later
thing, because references to the driver may exist in other threads, so
the unloading of the driver may free locks held by other schedulers and
whatnot.

erts/emulator/beam/erl_port_task.c

@@ -2001,10 +2001,10 @@ begin_port_cleanup(Port *pp, ErtsPortTask **execqp, int *processing_busy_q_p)
      * Schedule cleanup of port structure...
      */
 #ifdef ERTS_SMP
-    erts_schedule_thr_prgr_later_cleanup_op(release_port,
-					    (void *) pp,
-					    &pp->common.u.release,
-					    sizeof(Port));
+    /* Has to be more or less immediate to release any driver */
+    erts_schedule_thr_prgr_later_op(release_port,
+				    (void *) pp,
+				    &pp->common.u.release);
 #else
     pp->cleanup = 1;
 #endif