fix quality error

openedx/features/course_duration_limits/access.py

@@ -66,7 +66,6 @@ def get_user_course_expiration_date(user, course):
     if not CourseMode.verified_mode_for_course(course.id):
         return None
 
-    CourseEnrollment = apps.get_model('student.CourseEnrollment')
     enrollment = CourseEnrollment.get_enrollment(user, course.id)
     if enrollment is None or enrollment.mode != 'audit':
         return None