thermal/core: Fix unregistering netlink at thermal init time

The thermal subsystem initialization miss an netlink unregistering
function in the error. Add it.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/thermal/thermal_core.c

@@ -1607,7 +1607,7 @@ static int __init thermal_init(void)
 
 	result = thermal_register_governors();
 	if (result)
-		goto error;
+		goto unregister_netlink;
 
 	result = class_register(&thermal_class);
 	if (result)
@@ -1622,6 +1622,8 @@ static int __init thermal_init(void)
 
 unregister_governors:
 	thermal_unregister_governors();
+unregister_netlink:
+	thermal_netlink_exit();
 error:
 	ida_destroy(&thermal_tz_ida);
 	ida_destroy(&thermal_cdev_ida);

drivers/thermal/thermal_netlink.c

@@ -699,3 +699,8 @@ int __init thermal_netlink_init(void)
 {
 	return genl_register_family(&thermal_gnl_family);
 }
+
+void __init thermal_netlink_exit(void)
+{
+	genl_unregister_family(&thermal_gnl_family);
+}

drivers/thermal/thermal_netlink.h

@@ -13,6 +13,7 @@ struct thermal_genl_cpu_caps {
 /* Netlink notification function */
 #ifdef CONFIG_THERMAL_NETLINK
 int __init thermal_netlink_init(void);
+void __init thermal_netlink_exit(void);
 int thermal_notify_tz_create(int tz_id, const char *name);
 int thermal_notify_tz_delete(int tz_id);
 int thermal_notify_tz_enable(int tz_id);
@@ -115,4 +116,6 @@ static inline int thermal_genl_cpu_capability_event(int count, struct thermal_ge
 	return 0;
 }
 
+static inline void __init thermal_netlink_exit(void) {}
+
 #endif /* CONFIG_THERMAL_NETLINK */