Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 {
        release_mem_region(port->mapbase, ULITE_REGION);
        iounmap(port->membase);
-       port->membase = 0;
+       port->membase = NULL;
 }
 
 static int ulite_request_port(struct uart_port *port)
        port->iotype    = UPIO_MEM;
        port->iobase    = 1; /* mark port in use */
        port->mapbase   = res->start;
-       port->membase   = 0;
+       port->membase   = NULL;
        port->ops       = &ulite_ops;
        port->irq       = res2->start;
        port->flags     = UPF_BOOT_AUTOCONF;
                uart_remove_one_port(&ulite_uart_driver, port);
 
        /* mark port as free */
-       port->membase = 0;
+       port->membase = NULL;
 
        return 0;
 }