[gnome-control-center] user-accounts: Fix when GDM isn't installed

[Bastien Nocera <hadess src gnome org>]

commit 3be95176ef509b1c56a76145614142562ba576d6
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Jan 21 14:27:08 2011 +0000

    user-accounts: Fix when GDM isn't installed
    
    When GDM isn't installed, or isn't installed in the correct prefix,
    avoid accessing std_out[-1] of a 0-length std_out.

 panels/user-accounts/um-login-options.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/user-accounts/um-login-options.c b/panels/user-accounts/um-login-options.c
index 21fca28..78c2700 100644
--- a/panels/user-accounts/um-login-options.c
+++ b/panels/user-accounts/um-login-options.c
@@ -223,7 +223,7 @@ update_boolean_from_gconf (GtkWidget      *widget,
                 return;
         }
 
-        if (std_out[strlen (std_out) - 1] == '\n') {
+        if (strlen (std_out) > 0 && std_out[strlen (std_out) - 1] == '\n') {
                 std_out[strlen (std_out) - 1] = 0;
         }