[libgit2-glib] Fix ggit_patch_to_string for new name

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 59924ac06a7c963ad11dbd925e6c19742a91f492
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Fri Nov 22 19:25:46 2013 +0100

    Fix ggit_patch_to_string for new name

 libgit2-glib/ggit-patch.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libgit2-glib/ggit-patch.c b/libgit2-glib/ggit-patch.c
index 076051b..68efbba 100644
--- a/libgit2-glib/ggit-patch.c
+++ b/libgit2-glib/ggit-patch.c
@@ -185,7 +185,8 @@ ggit_patch_to_string (GgitPatch  *patch,
        g_return_val_if_fail (patch != NULL, NULL);
        g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
-       ret = git_patch_to_str (&retval, diff_patch->diff_patch);
+       ret = git_patch_to_str (&retval, patch->patch);
+
        if (ret == GIT_OK)
        {
                result = g_strdup (retval);