Index: wp-admin/update-core.php
===================================================================
--- wp-admin/update-core.php	(revision 19532)
+++ wp-admin/update-core.php	(working copy)
@@ -383,7 +383,6 @@
 	}
 
 	show_message( __('WordPress updated successfully') );
-	show_message( __('WordPress updated successfully') );
 	show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to WordPress %1$s. You will be redirected to the About WordPress screen. If not, click <a href="%s">here</a>.' ), $result, esc_url( admin_url( 'about.php?updated' ) ) ) . '</span>' );
 	show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to WordPress %1$s. <a href="%2$s">Learn more</a>.' ), $result, esc_url( admin_url( 'about.php?updated' ) ) ) . '</span>' );
 	?>