From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sat, 24 Apr 2021 02:56:31 +0000 (-0700)
Subject: anticipate failure from add_np_edges
X-Git-Tag: 2.47.2~13^2~31
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b18905f8e2630fff5de459b7f2d842621bcdfd02;p=graphviz

anticipate failure from add_np_edges

Related to #1801.
---

diff --git a/lib/ortho/ortho.c b/lib/ortho/ortho.c
index 7e00216ca..ffb43e45a 100644
--- a/lib/ortho/ortho.c
+++ b/lib/ortho/ortho.c
@@ -1082,8 +1082,12 @@ assignTracks (maze* mp)
     create_graphs(mp->vchans);
 
     /* add edges between non-parallel segments */
-    add_np_edges(mp->hchans);
-    add_np_edges(mp->vchans);
+    if (add_np_edges(mp->hchans) != 0) {
+	return -1;
+    }
+    if (add_np_edges(mp->vchans) != 0) {
+	return -1;
+    }
 
     /* add edges between parallel segments + remove appropriate edges */
     add_p_edges(mp->hchans, mp);