serial: max310x: simplify probe() and remove() error handling

Simplify error handling and only call uart_remove_one_port() if line bit
is set, instead of having to manually set s->p[i].port.dev to NULL.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20240118152213.2644269-10-hugo@hugovil.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>