Simplify a bit of internal code in CI_Form_validation
diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 6be593a..ed4b9bc 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -527,10 +527,7 @@
 			{
 				if ($row['is_array'] === FALSE)
 				{
-					if (isset($_POST[$row['field']]))
-					{
-						$_POST[$row['field']] = $row['postdata'];
-					}
+					isset($_POST[$field]) && $_POST[$field] = $row['postdata'];
 				}
 				else
 				{
@@ -550,20 +547,7 @@
 						}
 					}
 
-					if (is_array($row['postdata']))
-					{
-						$array = array();
-						foreach ($row['postdata'] as $k => $v)
-						{
-							$array[$k] = $v;
-						}
-
-						$post_ref = $array;
-					}
-					else
-					{
-						$post_ref = $row['postdata'];
-					}
+					$post_ref = $row['postdata'];
 				}
 			}
 		}