nl80211: Fix enum type of variable in nl80211_put_sta_rate()

rate_flg is of type 'enum nl80211_attrs', however it is assigned with
'enum nl80211_rate_info' values. Change the type of rate_flg accordingly.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -4203,7 +4203,7 @@ static bool nl80211_put_sta_rate(struct sk_buff *msg, struct rate_info *info,
 	struct nlattr *rate;
 	u32 bitrate;
 	u16 bitrate_compat;
-	enum nl80211_attrs rate_flg;
+	enum nl80211_rate_info rate_flg;
 
 	rate = nla_nest_start(msg, attr);
 	if (!rate)