cfg80211/mac80211: fix FTM settings across CSA

When FTM is enabled, doing a CSA will unexpectedly lose it since
the value of ftm_responder may be initialized to 0 instead of -1,
so fix that.

Fixes: 81e54d08d9d8 ("cfg80211: support FTM responder configuration/statistics")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -7870,6 +7870,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
 	}
 
 	memset(&params, 0, sizeof(params));
+	params.beacon_csa.ftm_responder = -1;
 
 	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ] ||
 	    !info->attrs[NL80211_ATTR_CH_SWITCH_COUNT])