feature/pgtk 7673b6b: * src/pgtkselect.c: Avoid Glib assertion warnings

[Yuuki Harano]

branch: feature/pgtk
commit 7673b6b9eb0af3add73e1614a466f142092b00aa
Author: Jindřich Makovička <makovick@gmail.com>
Commit: Yuuki Harano <masm+github@masm11.me>

    * 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 8ab7474..447c839 100644
--- a/src/pgtkselect.c
+++ b/src/pgtkselect.c
@@ -518,7 +518,7 @@ On Nextstep, TERMINAL is unused.  */)
 
   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;
 }