[libhandy] swipe-tracker: Make type check in _new() more robust

[Adrien Plazas <aplazas src gnome org>]

commit c263d31bbc3cc68b222ccd8bd8584e6d87775781
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Jun 15 01:43:52 2020 +0500

    swipe-tracker: Make type check in _new() more robust
    
    Signed-off-by: Alexander Mikhaylenko <alexm gnome org>

 src/hdy-swipe-tracker.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/hdy-swipe-tracker.c b/src/hdy-swipe-tracker.c
index e3110276..1f080b7c 100644
--- a/src/hdy-swipe-tracker.c
+++ b/src/hdy-swipe-tracker.c
@@ -836,7 +836,7 @@ hdy_swipe_tracker_new (HdySwipeable *swipeable)
 {
   gpointer swipe_tracker;
 
-  g_return_val_if_fail (swipeable != NULL, NULL);
+  g_return_val_if_fail (HDY_IS_SWIPEABLE (swipeable), NULL);
 
   swipe_tracker = g_object_get_data (G_OBJECT (swipeable), "swipe-tracker");