anticipate failure from decide_point

Related to #1801.

diff --git a/lib/ortho/ortho.c b/lib/ortho/ortho.c
index 81d1e61d18a4f5b4bea1f4004514bbb3f1992624..becbf37a08d247fea3aa89eab41014253bede436 100644 (file)
--- a/lib/ortho/ortho.c
+++ b/lib/ortho/ortho.c
@@ -1028,10 +1028,14 @@ addPEdges (channel* cp, maze* mp)
                            dir = 1;
                    }
 
-                   decide_point(&p, segs[i], segs[j], 0, dir);
+                   if (decide_point(&p, segs[i], segs[j], 0, dir) != 0) {
+                       return -1;
+                   }
                    hops.a = p.a;
                    prec1 = p.b;
-                   decide_point(&p, segs[i], segs[j], 1, 1-dir);
+                   if (decide_point(&p, segs[i], segs[j], 1, 1-dir) != 0) {
+                       return -1;
+                   }
                    hops.b = p.a;
                    prec2 = p.b;