Fix strict standard warning in user template

core/templates/layout.user.php

@@ -31,7 +31,7 @@
 
 			<ul id="settings" class="svg">
 				<span id="expand">
-					<?php echo OCP\User::getDisplayName($user=null)?OC_Util::sanitizeHTML(OCP\User::getDisplayName($user=null)):(OC_User::getUser()?OC_User::getUser():'') ?>
+					<?php echo $_['displayname'] ?>
 					<img class="svg" src="<?php echo image_path('', 'actions/caret.svg'); ?>" />
 				</span>
 				<div id="expanddiv">

lib/template.php

@@ -415,6 +415,8 @@ class OC_Template{
 			$page = new OC_TemplateLayout($this->renderas);
 			if($this->renderas == 'user') {
 				$page->assign('requesttoken', $this->vars['requesttoken']);
+				$user = OC_User::getUser();
+				$page->assign('displayname', OCP\User::getDisplayName($user));
 			}
 
 			// Add custom headers