[gnome-control-center] printers: Avoid dereferencing NULL variable

[Bastien Nocera <hadess src gnome org>]

commit 34dadb5ac3581dca86c25ddcce8a08898734261e
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Oct 20 15:50:00 2011 +0100

    printers: Avoid dereferencing NULL variable
    
    If line is NULL, then buffer is NULL, and buffer[0] points
    to nowhere.

 panels/printers/pp-new-printer-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/printers/pp-new-printer-dialog.c b/panels/printers/pp-new-printer-dialog.c
index 7dd0070..8bbd348 100644
--- a/panels/printers/pp-new-printer-dialog.c
+++ b/panels/printers/pp-new-printer-dialog.c
@@ -752,7 +752,7 @@ line_split (gchar *line)
         }
     }
 
-  if (buffer[0] != '\0')
+  if (buffer && buffer[0] != '\0')
     words[j++] = g_strdup (buffer);
 
   result = g_strdupv (words);