soundwire: bus: Simplify sdw_assign_device_num()

Simplify the code in sdw_assign_device_num(). Remove the new_device
flag which can be simply handled inline and do a bit less shuffling of
dev_num in and out of various variables. This patch should cause no
functional changes.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://lore.kernel.org/r/20250429101808.348462-2-ckeepax@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: charleskeepax

drivers/soundwire/bus.c

@@ -750,49 +750,44 @@ static int sdw_get_device_num(struct sdw_slave *slave)
 static int sdw_assign_device_num(struct sdw_slave *slave)
 {
 	struct sdw_bus *bus = slave->bus;
-	int ret, dev_num;
-	bool new_device = false;
+	struct device *dev = bus->dev;
+	int ret;
 
 	/* check first if device number is assigned, if so reuse that */
 	if (!slave->dev_num) {
 		if (!slave->dev_num_sticky) {
+			int dev_num;
+
 			mutex_lock(&slave->bus->bus_lock);
 			dev_num = sdw_get_device_num(slave);
 			mutex_unlock(&slave->bus->bus_lock);
 			if (dev_num < 0) {
-				dev_err(bus->dev, "Get dev_num failed: %d\n",
-					dev_num);
+				dev_err(dev, "Get dev_num failed: %d\n", dev_num);
 				return dev_num;
 			}
-			slave->dev_num = dev_num;
+
 			slave->dev_num_sticky = dev_num;
-			new_device = true;
 		} else {
-			slave->dev_num = slave->dev_num_sticky;
+			dev_dbg(dev, "Slave already registered, reusing dev_num: %d\n",
+				slave->dev_num_sticky);
 		}
 	}
 
-	if (!new_device)
-		dev_dbg(bus->dev,
-			"Slave already registered, reusing dev_num:%d\n",
-			slave->dev_num);
-
 	/* Clear the slave->dev_num to transfer message on device 0 */
-	dev_num = slave->dev_num;
 	slave->dev_num = 0;
 
-	ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
+	ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, slave->dev_num_sticky);
 	if (ret < 0) {
-		dev_err(bus->dev, "Program device_num %d failed: %d\n",
-			dev_num, ret);
+		dev_err(dev, "Program device_num %d failed: %d\n",
+			slave->dev_num_sticky, ret);
 		return ret;
 	}
 
 	/* After xfer of msg, restore dev_num */
 	slave->dev_num = slave->dev_num_sticky;
 
 	if (bus->ops && bus->ops->new_peripheral_assigned)
-		bus->ops->new_peripheral_assigned(bus, slave, dev_num);
+		bus->ops->new_peripheral_assigned(bus, slave, slave->dev_num);
 
 	return 0;
 }