fixed a bug that would lead to a PHP notice error of array to string conversion in prep_for_form()

http://codeigniter.com/bug_tracker/bug/4425/
diff --git a/system/libraries/Validation.php b/system/libraries/Validation.php
index 8796d7f..a0f038c 100644
--- a/system/libraries/Validation.php
+++ b/system/libraries/Validation.php
@@ -726,6 +726,8 @@
 			{

 				$data[$key] = $this->prep_for_form($val);

 			}

+			

+			return $data;

 		}

 		

 		if ($this->_safe_form_data == FALSE OR $data == '')

@@ -805,6 +807,6 @@
 

 }

 // END Validation Class

-
-/* End of file Validation.php */
+

+/* End of file Validation.php */

 /* Location: ./system/libraries/Validation.php */
\ No newline at end of file