-DUSE_POLL fix

Due to an oversight in the timer performance patch I submitted in
October, the timer code in st-1.5.0 does not compile when USE_POLL
is defined.  The enclosed patch will fix it.
-- 
Andreas Gustafsson, [email protected]

--- st-1.5.0/sched.c.orig	2004-01-11 14:21:55.000000000 -0800
+++ st-1.5.0/sched.c	2004-04-22 18:25:49.000000000 -0700
@@ -477,10 +477,13 @@
   }
   ST_ASSERT(pollfds <= _ST_POLLFDS + _ST_POLLFDS_SIZE);
 
-  if (ST_CLIST_IS_EMPTY(&_ST_SLEEPQ)) {
+  if (_ST_SLEEPQ == NULL) {
     timeout = -1;
   } else {
-    min_timeout = (_ST_THREAD_PTR(_ST_SLEEPQ.next))->sleep;
+    if (_ST_SLEEPQ->due <= _st_this_vp.last_clock)
+      min_timeout = 0;
+    else
+      min_timeout = _ST_SLEEPQ->due - _st_this_vp.last_clock;
     timeout = (int) (min_timeout / 1000);
   }
 


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