[libgit2-glib] Always initialize CallbackWrapperData with zeroes

[Christian Hergert <chergert src gnome org>]

commit 7af64b245e9806e6c2ba319ca30f41ec47139e00
Author: Christian Hergert <chergert redhat com>
Date:   Wed Aug 17 14:55:11 2016 +0200

    Always initialize CallbackWrapperData with zeroes
    
    This was causing a crash due to invalid pointers in the structure. This
    fixes that by simply starting from a zeroed structure.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770028

 libgit2-glib/ggit-diff.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/libgit2-glib/ggit-diff.c b/libgit2-glib/ggit-diff.c
index c7e9707..724c134 100644
--- a/libgit2-glib/ggit-diff.c
+++ b/libgit2-glib/ggit-diff.c
@@ -596,7 +596,7 @@ ggit_diff_foreach (GgitDiff              *diff,
                    GError               **error)
 {
        gint ret;
-       CallbackWrapperData wrapper_data;
+       CallbackWrapperData wrapper_data = { 0 };
        git_diff_file_cb real_file_cb = NULL;
        git_diff_binary_cb real_binary_cb = NULL;
        git_diff_hunk_cb real_hunk_cb = NULL;
@@ -669,7 +669,7 @@ ggit_diff_print (GgitDiff              *diff,
                  GError               **error)
 {
        gint ret;
-       CallbackWrapperData wrapper_data;
+       CallbackWrapperData wrapper_data = { 0 };
 
        g_return_if_fail (GGIT_IS_DIFF (diff));
        g_return_if_fail (print_cb != NULL);
@@ -813,7 +813,7 @@ ggit_diff_blobs (GgitBlob              *old_blob,
 {
        gint ret;
        const git_diff_options *gdiff_options;
-       CallbackWrapperData wrapper_data;
+       CallbackWrapperData wrapper_data = { 0 };
        git_diff_file_cb real_file_cb = NULL;
        git_diff_binary_cb real_binary_cb = NULL;
        git_diff_hunk_cb real_hunk_cb = NULL;
@@ -903,7 +903,7 @@ ggit_diff_blob_to_buffer (GgitBlob              *old_blob,
 {
        gint ret;
        const git_diff_options *gdiff_options;
-       CallbackWrapperData wrapper_data;
+       CallbackWrapperData wrapper_data = { 0 };
        git_diff_file_cb real_file_cb = NULL;
        git_diff_binary_cb real_binary_cb = NULL;
        git_diff_hunk_cb real_hunk_cb = NULL;