One newline is enough.

git-svn-id: https://develop.svn.wordpress.org/trunk@19684 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/plugin.php

@@ -308,7 +308,6 @@ function current_filter() {
 	return end( $wp_current_filter );
 }
 
-
 /**
  * Hooks a function on to a specific action.
  *
@@ -332,7 +331,6 @@ function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1)
 	return add_filter($tag, $function_to_add, $priority, $accepted_args);
 }
 
-
 /**
  * Execute functions hooked on a specific action hook.
  *