[gnome-control-center] user-accounts: Fix a critical warning if loading a cursor fails

[Robert Ancell <rancell src gnome org>]

commit 243ff6a5111e4ff7a117b06501167cf5c37e7fb6
Author: Philip Withnall <pwithnall endlessos org>
Date:   Tue Sep 29 14:58:47 2020 +0100

    user-accounts: 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/user-accounts/cc-crop-area.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/panels/user-accounts/cc-crop-area.c b/panels/user-accounts/cc-crop-area.c
index c4a04a630..fc7cb621d 100644
--- a/panels/user-accounts/cc-crop-area.c
+++ b/panels/user-accounts/cc-crop-area.c
@@ -352,10 +352,10 @@ update_cursor (CcCropArea *area,
         }
 
         if (cursor_type != area->current_cursor) {
-                GdkCursor *cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (area)),
-                                                                cursor_type);
+                g_autoptr(GdkCursor) cursor = NULL;
+                cursor = gdk_cursor_new_for_display (gtk_widget_get_display (GTK_WIDGET (area)),
+                                                     cursor_type);
                 gdk_window_set_cursor (gtk_widget_get_window (GTK_WIDGET (area)), cursor);
-                g_object_unref (cursor);
                 area->current_cursor = cursor_type;
         }
 }