[gnome-builder] project-file: fix return type

[Christian Hergert <chergert src gnome org>]

commit 2f964927a9bdaf7d42583d476312be8eb29c8be8
Author: Christian Hergert <christian hergert me>
Date:   Wed Apr 15 21:34:00 2015 -0700

    project-file: fix return type

 libide/ide-project-file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libide/ide-project-file.c b/libide/ide-project-file.c
index d4ef827..48d16dc 100644
--- a/libide/ide-project-file.c
+++ b/libide/ide-project-file.c
@@ -46,7 +46,7 @@ ide_project_file_get_is_directory (IdeProjectFile *self)
 {
   IdeProjectFilePrivate *priv = ide_project_file_get_instance_private (self);
 
-  g_return_val_if_fail (IDE_IS_PROJECT_FILE (self), NULL);
+  g_return_val_if_fail (IDE_IS_PROJECT_FILE (self), FALSE);
 
   if (priv->file_info)
     return (g_file_info_get_file_type (priv->file_info) == G_FILE_TYPE_DIRECTORY);