libertas: change IW_ESSID_MAX_SIZE -> IEEE80211_MAX_SSID_LEN

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/cmdresp.c b/drivers/net/wireless/libertas/cmdresp.c
index 384fc61..6e21038 100644
--- a/drivers/net/wireless/libertas/cmdresp.c
+++ b/drivers/net/wireless/libertas/cmdresp.c
@@ -68,7 +68,7 @@
 	 * no longer valid.
 	 */
 	memset(&priv->curbssparams.bssid, 0, ETH_ALEN);
-	memset(&priv->curbssparams.ssid, 0, IW_ESSID_MAX_SIZE);
+	memset(&priv->curbssparams.ssid, 0, IEEE80211_MAX_SSID_LEN);
 	priv->curbssparams.ssid_len = 0;
 
 	if (priv->psstate != PS_STATE_FULL_POWER) {