Fixed a ResourceWarning that wasn't properly fixed by the previous commit.

Also removed unused import in runtests.py.

tests/file_uploads/tests.py

@@ -271,12 +271,10 @@ class FileUploadTests(TestCase):
         file = tempfile.NamedTemporaryFile
         with file() as smallfile, file() as bigfile:
             # A small file (under the 5M quota)
-            smallfile = tempfile.NamedTemporaryFile()
             smallfile.write(b'a' * (2 ** 21))
             smallfile.seek(0)
 
             # A big file (over the quota)
-            bigfile = tempfile.NamedTemporaryFile()
             bigfile.write(b'a' * (10 * 2 ** 20))
             bigfile.seek(0)
 

tests/runtests.py

@@ -10,7 +10,7 @@ import warnings
 
 import django
 from django import contrib
-from django.apps import apps, AppConfig
+from django.apps import apps
 from django.conf import settings
 from django.db import connection
 from django.test import TransactionTestCase, TestCase