[glib] hmac: Make unit test const-correct

[Philip Withnall <pwithnall src gnome org>]

commit fdf14e9e6cbd2e373988d7b9e913788a58c63388
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed Feb 19 18:03:37 2014 +0000

    hmac: Make unit test const-correct
    
    https://bugzilla.gnome.org/show_bug.cgi?id=724741

 glib/tests/hmac.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/glib/tests/hmac.c b/glib/tests/hmac.c
index f6ee643..2a434db 100644
--- a/glib/tests/hmac.c
+++ b/glib/tests/hmac.c
@@ -156,11 +156,11 @@ guint8 result_sha1_test7[] = {
 
 typedef struct {
   GChecksumType digest_type;
-  gpointer key;
+  gconstpointer key;
   gsize key_len;
-  gpointer data;
+  gconstpointer data;
   gsize data_len;
-  gpointer result;
+  gconstpointer result;
 } HmacCase;
 
 HmacCase hmac_md5_tests[] = {