plat-rcar_gen4: standalone fs: Support for case object_id is NULL and object_id_len is zero

The TEE Internal Core API specification (v1.3.1) explicitly allows the
use of an empty object ID in TEE_RenamePersistentObject(). The text is:

newObjectID, newObjectIDLen: A buffer containing the new object
identifier. The identifier contains arbitrary bytes, including the
zero byte. The identifier length SHALL be less than or equal to
TEE_OBJECT_ID_MAX_LEN and can be zero.

Signed-off-by: Anh Vo <anh.vo.vx@renesas.com>
Signed-off-by: Nhi Nguyen <nhi.nguyen.kx@renesas.com>

Author: AnhVoRVC

core/arch/arm/plat-rcar_gen4/tee/tee_standalone_fs.c

@@ -358,8 +358,7 @@ static TEE_Result spi_alloc_file(struct tee_pobj *po, char **pfile,
 {
 	TEE_Result res;
 
-	if ((po->obj_id != NULL) && (po->obj_id_len > 0U) &&
-	    (po->obj_id_len <= TEE_OBJECT_ID_MAX_LEN)) {
+	if (po->obj_id_len <= TEE_OBJECT_ID_MAX_LEN) {
 		res = spi_alloc_path(po, pfile, len_out);
 	} else {
 		res = TEE_ERROR_BAD_PARAMETERS;
@@ -385,7 +384,7 @@ static TEE_Result spi_alloc_path(struct tee_pobj *po, char **ppath,
 		(void)memset(mpath, 0, dir_len + file_len);
 		pos = tee_b2hs((uint8_t *)&po->uuid, (uint8_t *)mpath,
 				sizeof(TEE_UUID), dir_len);
-		if (po->obj_id_len > 0U) {
+		if ((po->obj_id != NULL) && (po->obj_id_len > 0U)) {
 			mpath[pos] = '/';
 			pos++;
 			pos += tee_b2hs((uint8_t *)po->obj_id,