wireless: restrict to 32 legacy rates

Since the standards only define 12 legacy rates, 32 is certainly
a sane upper limit and we don't need to use u64 everywhere. Add
sanity checking that no more than 32 rates are registered and
change the variables to u32 throughout.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/p54.h

@@ -144,7 +144,7 @@ struct p54_common {
 	unsigned int output_power;
 	u32 tsf_low32;
 	u32 tsf_high32;
-	u64 basic_rate_mask;
+	u32 basic_rate_mask;
 	u16 wakeup_timer;
 	u16 aid;
 	struct ieee80211_tx_queue_stats tx_stats[8];