habanalabs: fix return value check in hl_fw_get_sec_attest_data()

If hl_cpu_accessible_dma_pool_alloc() fails, we should check
'req_cpu_addr', fix it.

Fixes: 0c88760f8f ("habanalabs/gaudi2: add secured attestation info uapi")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/firmware_if.c

@@ -2983,7 +2983,7 @@ static int hl_fw_get_sec_attest_data(struct hl_device *hdev, u32 packet_id, void
 	int rc;
 
 	req_cpu_addr = hl_cpu_accessible_dma_pool_alloc(hdev, size, &req_dma_addr);
-	if (!data) {
+	if (!req_cpu_addr) {
 		dev_err(hdev->dev,
 			"Failed to allocate DMA memory for CPU-CP packet %u\n", packet_id);
 		return -ENOMEM;