usb: misc: onboard_usb_hub: Drop reset delay in onboard_hub_power_off()

onboard_hub_power_off() currently has a delay after asserting the
reset of the hub. There is already a delay in onboard_hub_power_on()
before de-asserting the reset, which ensures that the reset is
asserted for the required time, so the delay in _power_off() is not
needed.

Skip the reset GPIO check before calling gpiod_set_value_cansleep(),
the function returns early when the GPIO descriptor is NULL.
Reviewed-By: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20220805111836.1.Id5a4dc0a2c046236116693aa55672295513a0f2a@changeidSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/onboard_usb_hub.c

@@ -71,10 +71,7 @@ static int onboard_hub_power_off(struct onboard_hub *hub)
 {
 	int err;
 
-	if (hub->reset_gpio) {
-		gpiod_set_value_cansleep(hub->reset_gpio, 1);
-		fsleep(hub->pdata->reset_us);
-	}
+	gpiod_set_value_cansleep(hub->reset_gpio, 1);
 
 	err = regulator_disable(hub->vdd);
 	if (err) {