NFC: digital: Fix a memory leak in NFC-F listening mode

When configured as a target listening for a SENSF_REQ poll command, a
nfcid2 array was allocated for no reason leading to a memory leak. The
nfcid2 is sent by the target in the SENSF_RES reply.
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

net/nfc/digital_technology.c

@@ -1257,21 +1257,12 @@ static int digital_tg_config_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
 int digital_tg_listen_nfcf(struct nfc_digital_dev *ddev, u8 rf_tech)
 {
 	int rc;
-	u8 *nfcid2;
 
 	rc = digital_tg_config_nfcf(ddev, rf_tech);
 	if (rc)
 		return rc;
 
-	nfcid2 = kzalloc(NFC_NFCID2_MAXSIZE, GFP_KERNEL);
-	if (!nfcid2)
-		return -ENOMEM;
-
-	nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
-	nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
-	get_random_bytes(nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
-
-	return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, nfcid2);
+	return digital_tg_listen(ddev, 300, digital_tg_recv_sensf_req, NULL);
 }
 
 void digital_tg_recv_md_req(struct nfc_digital_dev *ddev, void *arg,