Fixed pyflakes errors.

_pytest/main.py

@@ -8,7 +8,7 @@ try:
 except ImportError:
     from UserDict import DictMixin as MappingMixin
 
-from _pytest.runner import collect_one_node, Skipped
+from _pytest.runner import collect_one_node
 
 tracebackcutdir = py.path.local(_pytest.__file__).dirpath()
 

testing/python/collect.py

@@ -277,7 +277,7 @@ class TestFunction:
         assert hasattr(modcol.obj, 'test_func')
 
     def test_function_as_object_instance_ignored(self, testdir):
-        item = testdir.makepyfile("""
+        testdir.makepyfile("""
             class A:
                 def __call__(self, tmpdir):
                     0/0