fixed for styleguide.

|| to OR
remove the empty line at EOF
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 3e63784..4f2f491 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -816,7 +816,7 @@
 		}
 
 		// The query() function will set this flag to FALSE in the event that a query failed
-		if ($this->_trans_status === FALSE || $this->_trans_failure === TRUE)
+		if ($this->_trans_status === FALSE or $this->_trans_failure === TRUE)
 		{
 			$this->trans_rollback();
 
@@ -1859,4 +1859,4 @@
 }
 
 /* End of file DB_driver.php */
-/* Location: ./system/database/DB_driver.php */
+/* Location: ./system/database/DB_driver.php */
\ No newline at end of file