hwmon (coretemp) Fix a memory leak bug

In coretemp_init(), 'zone_devices' is allocated through kcalloc().
However, it is not deallocated in the following execution if
platform_driver_register() fails, leading to a memory leak. To fix this
issue, introduce the 'outzone' label to free 'zone_devices' before
returning the error.
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Link: https://lore.kernel.org/r/1566248402-6538-1-git-send-email-wenwen@cs.uga.eduSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/coretemp.c

@@ -736,7 +736,7 @@ static int __init coretemp_init(void)
 
 	err = platform_driver_register(&coretemp_driver);
 	if (err)
-		return err;
+		goto outzone;
 
 	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
 				coretemp_cpu_online, coretemp_cpu_offline);
@@ -747,6 +747,7 @@ static int __init coretemp_init(void)
 
 outdrv:
 	platform_driver_unregister(&coretemp_driver);
+outzone:
 	kfree(zone_devices);
 	return err;
 }