bug#56372: 29.0.50; [PATCH] Avoid BadMatch X11 error

[dick]

>From 5d2442a836a5641f8f1c2b4a844fe510a77bd8c5 Mon Sep 17 00:00:00 2001
From: dickmao <dick.r.chiang@gmail.com>
Date: Mon, 4 Jul 2022 00:47:34 -0400
Subject: [PATCH] Avoid segfault

* src/xterm.c (x_connection_closed): Avoid segfault.
---
 src/xterm.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index c5acb450837..464887da975 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -23518,17 +23518,18 @@ x_connection_closed (Display *dpy, const char 
*error_message, bool ioerror)
 
          fprintf (stderr, "X error handlers currently installed:\n");
 
-         for (failable = dpyinfo->failable_requests;
-              failable < dpyinfo->next_failable_request;
-              ++failable)
-           {
-             if (failable->end)
-               fprintf (stderr, "Ignoring errors between %lu to %lu\n",
-                        failable->start, failable->end);
-             else
-               fprintf (stderr, "Ignoring errors from %lu onwards\n",
-                        failable->start);
-           }
+         if (dpyinfo)
+           for (failable = dpyinfo->failable_requests;
+                failable < dpyinfo->next_failable_request;
+                ++failable)
+             {
+               if (failable->end)
+                 fprintf (stderr, "Ignoring errors between %lu to %lu\n",
+                          failable->start, failable->end);
+               else
+                 fprintf (stderr, "Ignoring errors from %lu onwards\n",
+                          failable->start);
+             }
 
          for (stack = x_error_message; stack; stack = stack->prev)
            fprintf (stderr, "Trapping errors from %lu\n",
-- 
2.36.1