dix: when unsetting a cursor, update the sprite immediately (#23608)

Removing the device cursor while the cursor was within the window did not
update the visible sprite until the next enter/leave event.

X.Org Bug 23608 <http://bugs.freedesktop.org/show_bug.cgi?id=23608>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

dix/window.c

@@ -3541,7 +3541,7 @@ ChangeWindowDeviceCursor(WindowPtr pWin,
                     pWin->optional->deviceCursors = pNode->next;
 
             xfree(pNode);
-            return Success;
+            goto out;
         }
 
     } else
@@ -3586,6 +3586,7 @@ ChangeWindowDeviceCursor(WindowPtr pWin,
         }
     }
 
+out:
     if (pWin->realized)
         WindowHasNewCursor(pWin);