[PATCH] src/pgtkselect.c: Avoid Glib assertion warnings

["Jindřich Makovička" <makovick@gmail.com>]

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Hi,

when the system clipboard has no owner, PGTK Emacs repeatedly shows
assertion warnings, like

(emacs:8121): GLib-GObject-CRITICAL **: 11:28:16.784:
g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed

The attached trivial one-liner fixes this.
-- 
Jindrich Makovicka

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From db777bd34f1452281963a4db27914a6a31a29549 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jind=C5=99ich=20Makovi=C4=8Dka?= <makovick@gmail.com>
Date: Sun, 30 May 2021 11:40:45 +0200
Subject: [PATCH] * src/pgtkselect.c: Avoid Glib assertion warnings

Do not call g_object_get_qdata, when the clipboard has no owner,
and obj is NULL. Just return Qnil immediately.
---
 src/pgtkselect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pgtkselect.c b/src/pgtkselect.c
index 8ab74744f3..447c839f45 100644
--- a/src/pgtkselect.c
+++ b/src/pgtkselect.c
@@ -518,7 +518,7 @@ DEFUN ("pgtk-selection-owner-p", Fpgtk_selection_owner_p, Spgtk_selection_owner_
 
   obj = gtk_clipboard_get_owner (cb);
 
-  return g_object_get_qdata (obj, quark_data) != NULL ? Qt : Qnil;
+  return obj && g_object_get_qdata (obj, quark_data) != NULL ? Qt : Qnil;
 }
 
 
-- 
2.32.0.rc0