[nautilus] window-slot: Change assert inside nautilus_window_slot_get_location

[Ernestas Kulik <ernestask src gnome org>]

commit 61a26927c90dcf4c80d37974ad9ca384004a8af9
Author: whs <hswongac gmail com>
Date:   Wed Apr 3 14:50:17 2019 +0800

    window-slot: Change assert inside nautilus_window_slot_get_location
    
    Closes https://gitlab.gnome.org/GNOME/nautilus/issues/970

 src/nautilus-window-slot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/nautilus-window-slot.c b/src/nautilus-window-slot.c
index e6157bc0e..c4d2fe1c9 100644
--- a/src/nautilus-window-slot.c
+++ b/src/nautilus-window-slot.c
@@ -3266,7 +3266,7 @@ nautilus_window_slot_get_location (NautilusWindowSlot *self)
 {
     NautilusWindowSlotPrivate *priv;
 
-    g_assert (self != NULL);
+    g_return_val_if_fail (NAUTILUS_IS_WINDOW_SLOT (self), NULL);
 
     priv = nautilus_window_slot_get_instance_private (self);