[perl-Gtk3] Fix an impreciseness in the test suite

[Torsten Schönfeld <tsch src gnome org>]

commit efa28956169181aa7da46fbe4400f7a5123e3abd
Author: Torsten Schönfeld <kaffeetisch gmx de>
Date:   Sun Nov 24 15:11:34 2013 +0100

    Fix an impreciseness in the test suite
    
    It did not show up with new enough Test::Simple.

 t/overrides.t |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/t/overrides.t b/t/overrides.t
index 02127b8..79a9358 100644
--- a/t/overrides.t
+++ b/t/overrides.t
@@ -569,7 +569,7 @@ SKIP: {
 # Gtk3::Gdk::Pixbuf::get_formats
 {
   my @formats = Gtk3::Gdk::Pixbuf::get_formats;
-  isa_ok (ref $formats[0], 'Gtk3::Gdk::PixbufFormat');
+  isa_ok ($formats[0], 'Gtk3::Gdk::PixbufFormat');
 }
 
 # Gtk3::Gdk::Pixbuf::new_from_data