firmware: arm_scmi: simplify exit path by returning on error

Yet another nasty indentation left out during code restructuring. It's
must simpler to return on error instead of having unnecessary indentation.
Suggested-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/driver.c

@@ -687,11 +687,12 @@ static int scmi_remove(struct platform_device *pdev)
 		list_del(&info->node);
 	mutex_unlock(&scmi_list_mutex);
 
-	if (!ret) {
+	if (ret)
+		return ret;
+
 	/* Safe to free channels since no more users */
 	ret = idr_for_each(idr, scmi_mbox_free_channel, idr);
 	idr_destroy(&info->tx_idr);
-	}
 
 	return ret;
 }