wifi: wfx: Remove some dead code

wait_for_completion_timeout() can not return a <0 value.
So simplify the logic and remove dead code.

-ERESTARTSYS can not be returned by do_wait_for_common() for tasks with
TASK_UNINTERRUPTIBLE, which is the case for wait_for_completion_timeout()
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/809c4a645c8d1306c0d256345515865c40ec731c.1676464422.git.christophe.jaillet@wanadoo.fr

drivers/net/wireless/silabs/wfx/main.c

@@ -358,13 +358,9 @@ int wfx_probe(struct wfx_dev *wdev)
 
 	wfx_bh_poll_irq(wdev);
 	err = wait_for_completion_timeout(&wdev->firmware_ready, 1 * HZ);
-	if (err <= 0) {
 	if (err == 0) {
 		dev_err(wdev->dev, "timeout while waiting for startup indication\n");
 		err = -ETIMEDOUT;
-		} else if (err == -ERESTARTSYS) {
-			dev_info(wdev->dev, "probe interrupted by user\n");
-		}
 		goto bh_unregister;
 	}