Apply suggestions from code review

Co-Authored-By: Victor Stinner <[email protected]>

Author: pablogsal

Lib/test/_test_multiprocessing.py

@@ -3277,8 +3277,8 @@ def test_context(self):
     @unittest.skipUnless(util.abstract_sockets_supported,
                          "test needs abstract socket support")
     def test_abstract_socket(self):
-        with self.connection.Listener("\0something") as l:
-            with self.connection.Client(l.address) as c:
+        with self.connection.Listener("\0something") as listener:
+            with self.connection.Client(l.address) as client:
                 with l.accept() as d:
                     c.send(1729)
                     self.assertEqual(d.recv(), 1729)