use t->backwards not t->seg->tr_backwards (which may not yet be set) when doing need_...

diff --git a/hostside/safety.c b/hostside/safety.c
index 4c77c643073659be7ec77191745d2afa68051575..bb3d2ed48d0767fdc619bb33b5be7cbabcda8c9f 100644 (file)
--- a/hostside/safety.c
+++ b/hostside/safety.c
@@ -631,7 +631,7 @@ static int fdet_nextseg(TrackLocation *t, TrackAdvanceContext *c,
   }
 
   if (u->elapsed < MARGIN_POLARISETIME) {
-    u->need_polarise |= (t->seg->seg_inverted ^ t->seg->tr_backwards ^
+    u->need_polarise |= (t->seg->seg_inverted ^ t->backwards ^
                         u->train_polarity_inverted);
   } else {
     u->walk_compute_polarise &= u->need_polarise;