[gnome-control-center/gnome-3-38] wacom: Fix a critical warning if loading a cursor fails

[Robert Ancell <rancell src gnome org>]

commit caefbf8a561ee02e5caf805ee435855d4aca7692
Author: Philip Withnall <pwithnall endlessos org>
Date:   Tue Sep 29 14:59:42 2020 +0100

    wacom: Fix a critical warning if loading a cursor fails
    
    It’s possible for `gdk_cursor_new_for_display()` to return `NULL`. It’s
    OK to pass `NULL` to `gdk_window_set_cursor()`, but not OK to then unref
    it.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 panels/wacom/calibrator/calibrator-gui.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/panels/wacom/calibrator/calibrator-gui.c b/panels/wacom/calibrator/calibrator-gui.c
index caff030c8..012291f8b 100644
--- a/panels/wacom/calibrator/calibrator-gui.c
+++ b/panels/wacom/calibrator/calibrator-gui.c
@@ -309,7 +309,7 @@ calib_area_new (GdkScreen      *screen,
   GdkMonitor *monitor;
 #ifndef FAKE_AREA
   GdkWindow *window;
-  GdkCursor *cursor;
+  g_autoptr(GdkCursor) cursor = NULL;
 #endif /* FAKE_AREA */
   GtkGesture *press;
 
@@ -344,7 +344,6 @@ calib_area_new (GdkScreen      *screen,
   window = gtk_widget_get_window (calib_area->window);
   cursor = gdk_cursor_new_for_display (gdk_display_get_default (), GDK_BLANK_CURSOR);
   gdk_window_set_cursor (window, cursor);
-  g_object_unref (cursor);
 
   gtk_widget_set_can_focus (calib_area->window, TRUE);
   gtk_window_set_keep_above (GTK_WINDOW (calib_area->window), TRUE);