Increment username just when link_existing_users is off

includes/openid-connect-generic-client-wrapper.php

@@ -534,6 +534,7 @@ class OpenID_Connect_Generic_Client_Wrapper {
 		// copy the username for incrementing
 		$username = $desired_username;
 
+		if (!$this->settings->link_existing_users) {
 		  // original user gets "name"
 		  // second user gets "name2"
 		  // etc
@@ -542,6 +543,7 @@ class OpenID_Connect_Generic_Client_Wrapper {
 			$count ++;
 			$username = $desired_username . $count;
 		  }
+		}
 
 		return $username;
 	}