fix unused imports

mfa/totp.py

@@ -7,11 +7,11 @@ import simplejson
 from django.conf import settings
 from django.http import HttpResponse
 from django.shortcuts import render
-from django.template.context import RequestContext
 from django.template.context_processors import csrf
 from django.utils import timezone
 from django.views.decorators.cache import never_cache
 
+from .Common import get_redirect_url
 from .models import User_Keys
 from .views import login