staging: wilc1000: handle_set_mac_address: fix missing blank line after declaration

commit 31cc9885e7 ("staging: wilc1000: handle_set_mac_address: use kmemdup")
introduces a new checkpatch warning, so this patch fixes it.

WARNING: Missing a blank line after declarations
FILE: drivers/staging/wilc1000/host_interface.c:430:

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -429,8 +429,9 @@ static void handle_set_mac_address(struct wilc_vif *vif,
 {
 	int ret = 0;
 	struct wid wid;
+	u8 *mac_buf;
 
-	u8 *mac_buf = kmemdup(set_mac_addr->mac_addr, ETH_ALEN, GFP_KERNEL);
+	mac_buf = kmemdup(set_mac_addr->mac_addr, ETH_ALEN, GFP_KERNEL);
 	if (!mac_buf)
 		return;