[phonemgr] Don't segfault when running the not yet installed gnome-phone-manager

[Daniele Forsi <dforsi src gnome org>]

commit d2e3cd9c421624d690f40a2417e56d8366313cdb
Author: Daniele Forsi <dforsi src gnome org>
Date:   Fri Feb 4 12:03:25 2011 +0100

    Don't segfault when running the not yet installed gnome-phone-manager
    
    The user interface files are searched relative to the current directory
    and when the filename is NULL both gtk_builder_add_objects_from_file()
    and gtk_builder_add_from_file() return 0 without setting error so
    dereferencing error->message causes a segmentation fault.

 src/ui.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/ui.c b/src/ui.c
index e1ad433..9169849 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -77,6 +77,7 @@ GtkBuilder *get_ui (MyApp *app, char *widget)
 	GtkBuilder *ui;
 
 	fname = get_resource (app, "phonemgr.ui");
+	g_return_val_if_fail (fname, NULL);
 
 	ui = gtk_builder_new ();