Fixed getUserFromClient not awaited.

Author: shrihari-prakash

lib/grant-types/client-credentials-grant-type.js

@@ -45,7 +45,7 @@ class ClientCredentialsGrantType extends AbstractGrantType {
     }
 
     const scope = this.getScope(request);
-    const user = this.getUserFromClient(client);
+    const user = await this.getUserFromClient(client);
 
     return this.saveToken(user, client, scope);
   }