[libgit2-glib] ggit_tree_get_by_file: return null if path does not exists

[Ignacio Casal Quinteiro <icq src gnome org>]

commit df5ca1c8027dd84634336da4c385c7d1e7e7513b
Author: Ignacio Casal Quinteiro <ignacio casal nice-software com>
Date:   Sun Jan 13 19:57:34 2013 +0100

    ggit_tree_get_by_file: return null if path does not exists

 libgit2-glib/ggit-tree.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/libgit2-glib/ggit-tree.c b/libgit2-glib/ggit-tree.c
index ec834a5..33b02f8 100644
--- a/libgit2-glib/ggit-tree.c
+++ b/libgit2-glib/ggit-tree.c
@@ -142,16 +142,23 @@ ggit_tree_get_by_file (GgitTree *tree,
 {
 	git_tree *t;
 	gchar *path;
-	GgitTreeEntry *entry;
+	GgitTreeEntry *entry = NULL;
+	const git_tree_entry *tree_entry;
 
 	g_return_val_if_fail (GGIT_IS_TREE (tree), NULL);
+	g_return_val_if_fail (G_IS_FILE (file), NULL);
 
 	t = _ggit_native_get (tree);
 
 	path = g_file_get_path (file);
-	entry = _ggit_tree_entry_wrap (git_tree_entry_byname (t, path));
+	tree_entry = git_tree_entry_byname (t, path);
 	g_free (path);
 
+	if (tree_entry != NULL)
+	{
+		entry = _ggit_tree_entry_wrap (tree_entry);
+	}
+
 	return entry;
 }