Revert "Remove unnecessary return"

This reverts commit 843d2506e1a1eab17b871bc38b204d27047c9ff7.
diff --git a/system/database/drivers/odbc/odbc_driver.php b/system/database/drivers/odbc/odbc_driver.php
index 559617a..f5d77a1 100644
--- a/system/database/drivers/odbc/odbc_driver.php
+++ b/system/database/drivers/odbc/odbc_driver.php
@@ -255,7 +255,7 @@
 
 		if ($prefix_limit !== FALSE && $this->dbprefix !== '')
 		{
-			$sql ." AND table_name LIKE '".$this->escape_like_str($this->dbprefix)."%' "
+			return $sql." AND table_name LIKE '".$this->escape_like_str($this->dbprefix)."%' "
 				.sprintf($this->_like_escape_str, $this->_like_escape_chr);
 		}