sna/trapezoids: Remove stale assert

The variable changed meaning, but the assert did not. Fix that up.

Reported-by: Matti Hämäläinen <ccr@tnsp.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/sna/sna_trapezoids_imprecise.c b/src/sna/sna_trapezoids_imprecise.c
index 865a7232..414e80a2 100644
--- a/src/sna/sna_trapezoids_imprecise.c
+++ b/src/sna/sna_trapezoids_imprecise.c
@@ -473,7 +473,8 @@ polygon_add_edge(struct polygon *polygon,
 	struct edge *e = &polygon->edges[polygon->num_edges];
 	int ytop, ybot;
 
-	assert (dy > 0);
+	assert(t->bottom > t->top);
+	assert(edge->p2.y > edge->p1.y);
 
 	e->dir = dir;