[gthumb] overwrite dialog: source can be null, destination cannot

[Paolo Bacchilega <paobac src gnome org>]

commit dbf1cc713c4ad1eb9e252597fcbc65aa6f429fa6
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Apr 20 13:28:36 2019 +0200

    overwrite dialog: source can be null, destination cannot

 gthumb/gth-overwrite-dialog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gthumb/gth-overwrite-dialog.c b/gthumb/gth-overwrite-dialog.c
index a1bd0bf1..ca283dea 100644
--- a/gthumb/gth-overwrite-dialog.c
+++ b/gthumb/gth-overwrite-dialog.c
@@ -333,7 +333,7 @@ gth_overwrite_dialog_new (GFile                *source,
 {
        GthOverwriteDialog *self;
 
-       g_return_val_if_fail (G_IS_FILE (source), NULL);
+       g_return_val_if_fail (G_IS_FILE (destination), NULL);
 
        self = g_object_new (GTH_TYPE_OVERWRITE_DIALOG,
                             "use-header-bar", _gtk_settings_get_dialogs_use_header (),