Be less verbose when erroring out in do_feed() for an invalid feed template. fixes #24874.

Built from https://develop.svn.wordpress.org/trunk@25190


git-svn-id: http://core.svn.wordpress.org/trunk@25162 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -1005,10 +1005,8 @@ function do_feed() {
 		$feed = get_default_feed();
 
 	$hook = 'do_feed_' . $feed;
-	if ( !has_action($hook) ) {
-		$message = sprintf( __( 'ERROR: %s is not a valid feed template.' ), esc_html($feed));
-		wp_die( $message, '', array( 'response' => 404 ) );
-	}
+	if ( ! has_action( $hook ) )
+		wp_die( __( 'ERROR: This is not a valid feed template.' ), '', array( 'response' => 404 ) );
 
 	do_action( $hook, $wp_query->is_comment_feed );
 }