libertas: precedence bug

Negate has precedence over comparison so the original test was always
false.  (Neither 0 nor 1 are equal to NL80211_IFTYPE_MONITOR).

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/tx.c b/drivers/net/wireless/libertas/tx.c
index 411a3bb..8000ca6 100644
--- a/drivers/net/wireless/libertas/tx.c
+++ b/drivers/net/wireless/libertas/tx.c
@@ -180,7 +180,7 @@
 {
 	struct tx_radiotap_hdr *radiotap_hdr;
 
-	if (!priv->wdev->iftype == NL80211_IFTYPE_MONITOR ||
+	if (priv->wdev->iftype != NL80211_IFTYPE_MONITOR ||
 	    priv->currenttxskb == NULL)
 		return;