Remove unused variable setting for $revisions in wp_prepare_revisions_for_js().

See #27882.


Built from https://develop.svn.wordpress.org/trunk@28264


git-svn-id: http://core.svn.wordpress.org/trunk@28092 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/revision.php

@@ -108,7 +108,7 @@ function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {
  */
 function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null ) {
 	$post = get_post( $post );
-	$revisions = $authors = array();
+	$authors = array();
 	$now_gmt = time();
 
 	$revisions = wp_get_post_revisions( $post->ID, array( 'order' => 'ASC', 'check_enabled' => false ) );