W3C Validation ERROR: Bad value X-XRDS-Location for attribute http-equiv on elem

wordpress social auth plugin automatically adds this line to the head of every page.

<meta http-equiv=”X-XRDS-Location” content=”http://www.mysite.com/wp-content/plugins/socialauth-wp/hybridauth/index.php?get=openid_xrds&#8221; />

I am not sure what this line does to the site but it throws a validation error.

What does the meta line does to the site, is it mandatory?

How to remove that line? or Fix it?

http://wordpress.org/plugins/socialauth-wp/