Clean up a few more pyflakes warnings

lib/ansible/executor/process/worker.py

@@ -70,7 +70,7 @@ class WorkerProcess(multiprocessing.Process):
             if fileno is not None:
                 try:
                     self._new_stdin = os.fdopen(os.dup(fileno))
-                except OSError as e:
+                except OSError:
                     # couldn't dupe stdin, most likely because it's
                     # not a valid file descriptor, so we just rely on
                     # using the one that was passed in