hwspinlock: omap: Emit only one error message for errors in .remove()

If a remove callback of a platform driver returns a non-zero value, the
driver core emits an error message, otherwise ignores the value and
completes unbinding the device.

As omap_hwspinlock_remove() already emits an error message, suppress the
core's error message by returning zero.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230314180100.2865801-1-u.kleine-koenig@pengutronix.deSigned-off-by: Bjorn Andersson <andersson@kernel.org>

drivers/hwspinlock/omap_hwspinlock.c

@@ -153,7 +153,7 @@ static int omap_hwspinlock_remove(struct platform_device *pdev)
 	ret = hwspin_lock_unregister(bank);
 	if (ret) {
 		dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret);
-		return ret;
+		return 0;
 	}
 
 	pm_runtime_disable(&pdev->dev);