libertas: ensure response buffer size is always set for lbs_cmd_with_response

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/if_usb.c b/drivers/net/wireless/libertas/if_usb.c
index cf88251..8bc23b3 100644
--- a/drivers/net/wireless/libertas/if_usb.c
+++ b/drivers/net/wireless/libertas/if_usb.c
@@ -106,6 +106,7 @@
 {
 	struct cmd_ds_set_boot2_ver b2_cmd;
 
+	b2_cmd.hdr.size = cpu_to_le16(sizeof(b2_cmd));
 	b2_cmd.action = 0;
 	b2_cmd.version = priv->boot2_version;