[gdk-pixbuf] tests: Don't use g_assert_nonnull yet

[Bastien Nocera <hadess src gnome org>]

commit 3b98556b5d602ead6366edb8b8d0053ad0cd4def
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Oct 24 15:41:03 2014 +0200

    tests: Don't use g_assert_nonnull yet
    
    So that we don't require glib 2.40.

 tests/pixbuf-short-gif-write.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/tests/pixbuf-short-gif-write.c b/tests/pixbuf-short-gif-write.c
index 592ef6b..6c188f4 100644
--- a/tests/pixbuf-short-gif-write.c
+++ b/tests/pixbuf-short-gif-write.c
@@ -36,11 +36,11 @@ static void
 test_short_gif_write (void)
 {
     GIOChannel* channel = g_io_channel_new_file (g_test_get_filename (G_TEST_DIST, "test-animation.gif", 
NULL), "r", NULL);
-    g_assert_nonnull (channel);
+    g_assert (channel != NULL);
     g_io_channel_set_encoding (channel, NULL, NULL);
 
     GdkPixbufLoader *loader = gdk_pixbuf_loader_new_with_type ("gif", NULL);
-    g_assert_nonnull (loader);
+    g_assert (loader != NULL);
 
     loader_write_from_channel (loader, channel, 10);
     loader_write_from_channel (loader, channel, G_MAXSIZE);