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

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Closes: https://lore.kernel.org/r/202410021851.sGmBSrDd-lkp@intel.com/
Signed-off-by: Janne Grunau <j@jannau.net>

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;
 	}