SEO checklist output is not valid.

The variable $checked is setup wrongly with regard to its later use.
The resulting output is not valid.

Well, actually it is not even well-formed! :)

I spotted the problem serving my pages as XML, see http://drupal.org/node/475242

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>

diff -pruN seo_checklist.orig/SEOChecklist.module seo_checklist/SEOChecklist.module
--- seo_checklist.orig/SEOChecklist.module      2009-02-19 14:04:47.000000000 +0000
+++ seo_checklist/SEOChecklist.module   2009-06-01 17:59:38.000000000 +0000
@@ -87,7 +87,7 @@ $result = db_query($sql);
 $temp= db_result(db_query($sql));
 $checked='';
 if($temp==1)
-$checked='checked';
+$checked=' checked="checked"';
 
 $form['space'] = array(
 '#value' =>'<br />'
@@ -384,4 +384,4 @@ function seochecklist_footer($main = 0) 
                        }
                }
        }
-}
\ No newline at end of file
+}