Removed import forgotten in previous commit.

django/core/files/storage.py

@@ -3,7 +3,6 @@ import errno
 from datetime import datetime
 
 from django.conf import settings
-from django.core.exceptions import SuspiciousFileOperation
 from django.core.files import locks, File
 from django.core.files.move import file_move_safe
 from django.utils.crypto import get_random_string