From 5ea652e0c67c484cd7727903de26f7e49e402db0 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Sat, 26 Jun 2021 16:59:07 +0300
Subject: [PATCH] Explicitly check for not STONE in corridor join

... instead of relying STONE being 0
---
 src/mklev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mklev.c b/src/mklev.c
index ea4597757..7a5992b82 100644
--- a/src/mklev.c
+++ b/src/mklev.c
@@ -375,7 +375,7 @@ join(register int a, register int b, boolean nxcor)
     yy = cc.y;
     tx = tt.x - dx;
     ty = tt.y - dy;
-    if (nxcor && levl[xx + dx][yy + dy].typ)
+    if (nxcor && levl[xx + dx][yy + dy].typ != STONE)
         return;
     if (okdoor(xx, yy) || !nxcor)
         dodoor(xx, yy, croom);