Remove one_iteration() argument

The one_iteration() function accepts no parameters.
Signed-off-by: Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>

test/test6.c

@@ -865,7 +865,7 @@ int sendAndReceive(void)
 
 	while (!stopping)
 	{
-		one_iteration(client);
+		one_iteration();
 	}
 	
 disconnect_exit: