mwifiex: fix cmd_skb headroom decreasing issue

Before calling host_to_card() to send the cmd to firmware,
we use skb_push() to add 4 bytes SDIO interface header at
the start of the data buffer. Since cmd_skb data structure
will be re-used at a later time, we need to restore its
headroom by removing the 4 bytes header.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/cmdevt.c

@@ -206,6 +206,8 @@ static int mwifiex_dnld_cmd_to_fw(struct mwifiex_private *priv,
 					     cmd_node->cmd_skb->data,
 					     cmd_node->cmd_skb->len, NULL);
 
+	skb_pull(cmd_node->cmd_skb, INTF_HEADER_LEN);
+
 	if (ret == -1) {
 		dev_err(adapter->dev, "DNLD_CMD: host to card failed\n");
 		if (wait_queue)