thermal/core: Fix memory leak in the error path

stable inclusion
from stable-v5.10.121
commit 54cdc10ac7184f2159a4f5658b497e90244d1516
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=54cdc10ac7184f2159a4f5658b497e90244d1516

--------------------------------

commit d44616c6 upstream.

Fix the following error:

 smatch warnings:
 drivers/thermal/thermal_core.c:1020 __thermal_cooling_device_register() warn: possible memory leak of 'cdev'

by freeing the cdev when exiting the function in the error path.

Fixes: 58483761 ("thermal/drivers/core: Use a char pointer for the cooling device name")
Reported-by: Nkernel test robot <lkp@intel.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210319202257.890848-1-daniel.lezcano@linaro.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/thermal/thermal_core.c

@@ -1152,6 +1152,7 @@ __thermal_cooling_device_register(struct device_node *np,
 out_ida_remove:
 	ida_simple_remove(&thermal_cdev_ida, id);
 out_kfree_cdev:
+	kfree(cdev);
 	return ERR_PTR(ret);
 }