[bug report] wifi: cw1200: Convert to GPIO descriptors

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hello Linus Walleij,

Commit 2719a9e7156c ("wifi: cw1200: Convert to GPIO descriptors")
from Jan 31, 2024 (linux-next), leads to the following Smatch static
checker warning:

	drivers/net/wireless/st/cw1200/cw1200_spi.c:446 cw1200_spi_disconnect()
	error: we previously assumed 'self' could be null (see line 439)

drivers/net/wireless/st/cw1200/cw1200_spi.c
    435 static void cw1200_spi_disconnect(struct spi_device *func)
    436 {
    437         struct hwbus_priv *self = spi_get_drvdata(func);
    438 
    439         if (self) {
                    ^^^^
This check can hopefully be removed?

    440                 cw1200_spi_irq_unsubscribe(self);
    441                 if (self->core) {
    442                         cw1200_core_release(self->core);
    443                         self->core = NULL;
    444                 }
    445         }
--> 446         cw1200_spi_off(self, dev_get_platdata(&func->dev));
                               ^^^^
Otherwise we are in trouble.  Unchecked dereference inside the function.

    447 }

regards,
dan carpenter