wil6210: Fix IP version indication for Tx csum offload

Bit DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS should be set for IPv4
only. Don't set it for IPv6
Signed-off-by: NVladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/txrx.c

@@ -673,9 +673,12 @@ static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
 		return 0;
 
+	d->dma.b11 = ETH_HLEN; /* MAC header length */
+
 	switch (skb->protocol) {
 	case cpu_to_be16(ETH_P_IP):
 		protocol = ip_hdr(skb)->protocol;
+		d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
 		break;
 	case cpu_to_be16(ETH_P_IPV6):
 		protocol = ipv6_hdr(skb)->nexthdr;
@@ -701,8 +704,6 @@ static int wil_tx_desc_offload_cksum_set(struct wil6210_priv *wil,
 	}
 
 	d->dma.ip_length = skb_network_header_len(skb);
-	d->dma.b11 = ETH_HLEN; /* MAC header length */
-	d->dma.b11 |= BIT(DMA_CFG_DESC_TX_OFFLOAD_CFG_L3T_IPV4_POS);
 	/* Enable TCP/UDP checksum */
 	d->dma.d0 |= BIT(DMA_CFG_DESC_TX_0_TCP_UDP_CHECKSUM_EN_POS);
 	/* Calculate pseudo-header */