NFC: NCI: zero struct spi_transfer variables before usage

Using ARM compiler, and without zero-ing spi_transfer, spi-s3c64xx
driver would issue abnormal errors due to bpw field value being set to
unexpected value. This structure MUST be set to all zeros except for
those field specifically used.
Signed-off-by: NEric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: NSamuel Ortiz <sameo@linux.intel.com>

net/nfc/nci/spi.c

@@ -44,6 +44,7 @@ static int __nci_spi_send(struct nci_spi *nspi, struct sk_buff *skb)
 	struct spi_message m;
 	struct spi_transfer t;
 
+	memset(&t, 0, sizeof(struct spi_transfer));
 	t.tx_buf = skb->data;
 	t.len = skb->len;
 	t.cs_change = 0;
@@ -173,16 +174,21 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi *nspi)
 	int ret;
 
 	spi_message_init(&m);
+
+	memset(&tx, 0, sizeof(struct spi_transfer));
 	req[0] = NCI_SPI_DIRECT_READ;
 	req[1] = nspi->acknowledge_mode;
 	tx.tx_buf = req;
 	tx.len = 2;
 	tx.cs_change = 0;
 	spi_message_add_tail(&tx, &m);
+
+	memset(&rx, 0, sizeof(struct spi_transfer));
 	rx.rx_buf = resp_hdr;
 	rx.len = 2;
 	rx.cs_change = 1;
 	spi_message_add_tail(&rx, &m);
+
 	ret = spi_sync(nspi->spi, &m);
 
 	if (ret)
@@ -199,11 +205,14 @@ static struct sk_buff *__nci_spi_recv_frame(struct nci_spi *nspi)
 		return NULL;
 
 	spi_message_init(&m);
+
+	memset(&rx, 0, sizeof(struct spi_transfer));
 	rx.rx_buf = skb_put(skb, rx_len);
 	rx.len = rx_len;
 	rx.cs_change = 0;
 	rx.delay_usecs = nspi->xfer_udelay;
 	spi_message_add_tail(&rx, &m);
+
 	ret = spi_sync(nspi->spi, &m);
 
 	if (ret)