ecryptfs: remove unnessesary null check in ecryptfs_keyring_auth_tok_for_sig

request_key and ecryptfs_get_encrypted_key never
return a NULL pointer, so no need do a null check.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

fs/ecryptfs/keystore.c

@@ -1627,9 +1627,9 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
 	int rc = 0;
 
 	(*auth_tok_key) = request_key(&key_type_user, sig, NULL);
-	if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
+	if (IS_ERR(*auth_tok_key)) {
 		(*auth_tok_key) = ecryptfs_get_encrypted_key(sig);
-		if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
+		if (IS_ERR(*auth_tok_key)) {
 			printk(KERN_ERR "Could not find key with description: [%s]\n",
 			      sig);
 			rc = process_request_key_err(PTR_ERR(*auth_tok_key));