Revert "Remove unnecessary return"

This reverts commit 843d2506e1a1eab17b871bc38b204d27047c9ff7.
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index 8f72199..3f3e3f0 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -430,7 +430,7 @@
 
 		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
 		{
-			$sql .' AND "table_name" LIKE \''
+			return $sql.' AND "table_name" LIKE \''
 				.$this->escape_like_str($this->dbprefix)."%' "
 				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
 		}