Close sys.stdin after we create the unbuffered version

ethermess.py

@@ -193,8 +193,10 @@ def handle_message(mac, message):
 		print('<%s> %s' % (nick, ascii(line)))
 
 def eventloop(proc):
-	# Create unbuffered version of stdin
+	# Create unbuffered version of stdin and close the old one as we
+	# won't need it anymore
 	unbuf_stdin = open(sys.stdin.buffer.fileno(), 'rb', buffering = 0)
+	sys.stdin.close()
 
 	# Set up a poll for inputs (but do output blockingly)
 	poll = select.poll()