tee: amdtee: skip tee_device_unregister if tee_device_alloc fails

Currently, if tee_device_alloc() fails, then tee_device_unregister()
is a no-op. Therefore, skip the function call to tee_device_unregister() by
introducing a new goto label 'err_free_pool'.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/tee/amdtee/core.c

@@ -465,7 +465,7 @@ static int __init amdtee_driver_init(void)
 	teedev = tee_device_alloc(&amdtee_desc, NULL, pool, amdtee);
 	if (IS_ERR(teedev)) {
 		rc = PTR_ERR(teedev);
-		goto err;
+		goto err_free_pool;
 	}
 	amdtee->teedev = teedev;
 
@@ -482,6 +482,8 @@ static int __init amdtee_driver_init(void)
 
 err:
 	tee_device_unregister(amdtee->teedev);
+
+err_free_pool:
 	if (pool)
 		tee_shm_pool_free(pool);