Issue #10816: multiprocessing.SocketClient() closes the socket on error

Use a context manager to close immediatly the socket on error.

Lib/multiprocessing/connection.py

@@ -281,7 +281,7 @@ def SocketClient(address):
     Return a connection object connected to the socket given by `address`
     '''
     family = address_type(address)
-    s = socket.socket( getattr(socket, family) )
+    with socket.socket( getattr(socket, family) ) as s:
         t = _init_timeout()
 
         while 1:
@@ -299,7 +299,6 @@ def SocketClient(address):
 
         fd = duplicate(s.fileno())
     conn = _multiprocessing.Connection(fd)
-    s.close()
     return conn
 
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