[gtksourceview/wip/chergert/gsv-gtk4: 177/194] fileloader: always return a GError with FALSE

[Christian Hergert <chergert src gnome org>]

commit e2c758423948ae676a84b34840913b4d396aeec5
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 7 14:29:08 2020 -0700

    fileloader: always return a GError with FALSE

 gtksourceview/gtksourcefileloader.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/gtksourceview/gtksourcefileloader.c b/gtksourceview/gtksourcefileloader.c
index ead44011..ff02ab09 100644
--- a/gtksourceview/gtksourcefileloader.c
+++ b/gtksourceview/gtksourcefileloader.c
@@ -1122,7 +1122,10 @@ gtk_source_file_loader_load_async (GtkSourceFileLoader   *loader,
            loader->file == NULL ||
            (loader->location == NULL && loader->input_stream_property == NULL))
        {
-               g_task_return_boolean (loader->task, FALSE);
+               g_task_return_new_error (loader->task,
+                                        G_IO_ERROR,
+                                        G_IO_ERROR_INVALID_ARGUMENT,
+                                        "Invalid argument");
                return;
        }