net/mac80211/rx.c: fix off-by-one

This patch fixes an off-by-one in net/mac80211/rx.c introduced by
commit 8318d78a
(cfg80211 API for channels/bitrates, mac80211 and driver conversion)
and spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/rx.c

@@ -2170,7 +2170,7 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	struct ieee80211_supported_band *sband;
 
 	if (status->band < 0 ||
-	    status->band > IEEE80211_NUM_BANDS) {
+	    status->band >= IEEE80211_NUM_BANDS) {
 		WARN_ON(1);
 		return;
 	}