Remove redundant contextlib.closing

Author: AA-Turner

sphinx_autobuild/utils.py

@@ -1,15 +1,14 @@
 """Generic utilities."""
 
 import socket
-from contextlib import closing
 
 
 def find_free_port():
     """Find and return a free port number.
 
     Shout-out to https://stackoverflow.com/a/45690594/1931274!
     """
-    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
         s.bind(("", 0))
         s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
         return s.getsockname()[1]