mwifiex: corrections in PCIe event skb handling

Preallocated event SKBs are getting reused for PCIe chipset.
Their physical addresses are shared with firmware so that
firmware can write data into them.

This patch makes sure that SKB is cleared and length is set to
default while submitting it to firmware.
Signed-off-by: NAmitkumar Karwar <akarwar@marvell.com>
Signed-off-by: NZhaoyang Liu <liuzy@marvell.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mwifiex/pcie.c

@@ -1807,6 +1807,8 @@ static int mwifiex_pcie_event_complete(struct mwifiex_adapter *adapter,
 
 	if (!card->evt_buf_list[rdptr]) {
 		skb_push(skb, INTF_HEADER_LEN);
+		skb_put(skb, MAX_EVENT_SIZE - skb->len);
+		memset(skb->data, 0, MAX_EVENT_SIZE);
 		if (mwifiex_map_pci_memory(adapter, skb,
 					   MAX_EVENT_SIZE,
 					   PCI_DMA_FROMDEVICE))