[libgit2-glib] Check for valid repository

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

commit 1a81cc559249932aec3508253ba978a8c0ecda20
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sat Jun 29 10:21:58 2013 +0200

    Check for valid repository

 libgit2-glib/ggit-tree-builder.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/libgit2-glib/ggit-tree-builder.c b/libgit2-glib/ggit-tree-builder.c
index b677cb7..75c57c5 100644
--- a/libgit2-glib/ggit-tree-builder.c
+++ b/libgit2-glib/ggit-tree-builder.c
@@ -23,6 +23,7 @@
 #include "ggit-tree-builder.h"
 #include "ggit-error.h"
 #include "ggit-tree-entry.h"
+#include "ggit-repository.h"
 
 #define GGIT_TREE_BUILDER_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE((object), GGIT_TYPE_TREE_BUILDER, 
GgitTreeBuilderPrivate))
 
@@ -70,6 +71,9 @@ _ggit_tree_builder_wrap (git_treebuilder *builder,
 {
        GgitTreeBuilder *gbuilder;
 
+       g_return_val_if_fail (builder != NULL, NULL);
+       g_return_val_if_fail (GGIT_IS_REPOSITORY (repository), NULL);
+
        gbuilder = g_object_new (GGIT_TYPE_TREE_BUILDER,
                                 "native", builder,
                                 NULL);