phy: apple: atc: Add missing mutex_unlock in error case

Reported-by: kernel test robot <[email protected]>
Reported-by: Julia Lawall <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Janne Grunau <[email protected]>

Author: jannau

drivers/phy/apple/atc.c

@@ -1624,6 +1624,7 @@ static int atcphy_usb3_power_on(struct phy *phy)
 
 	if (atcphy->mode != atcphy->target_mode) {
 		dev_err(atcphy->dev, "ATCPHY did not come up; won't allow dwc3 to come up.\n");
+		mutex_unlock(&atcphy->lock);
 		return -EINVAL;
 	}