libckteec: fix memory allocation leakage on template serialization

Fix memory allocation leakage with a call to release_serial_object()
to release obj2 before serialize_indirect_attribute() returns.

Link: OP-TEE#387
Fixes: e88c264 ("libckteec: helper function to serialize a attribute template")
Signed-off-by: Hoyong Jin <hoyong2007@naver.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

libckteec/src/serialize_ck.c

@@ -95,17 +95,19 @@ static CK_RV serialize_indirect_attribute(struct serializer *obj,
 	 */
 	rv = serialize_32b(obj, attribute->type);
 	if (rv)
-		return rv;
+		goto out;
 
 	rv = serialize_32b(obj, obj2.size);
 	if (rv)
-		return rv;
+		goto out;
 
 	rv = serialize_buffer(obj, obj2.buffer, obj2.size);
 	if (rv)
-		return rv;
+		goto out;
 
 	obj->item_count++;
+out:
+	release_serial_object(&obj2);
 
 	return rv;
 }