cfg80211: fix memory leak in nl80211_probe_mesh_link

The per-tid statistics need to be released after the call to rdev_get_station

Cc: stable@vger.kernel.org
Fixes: 5ab92e7fe4 ("cfg80211: add support to probe unexercised mesh link")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20200108170630.33680-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -13796,6 +13796,8 @@ static int nl80211_probe_mesh_link(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		return err;
 
+	cfg80211_sinfo_release_content(&sinfo);
+
 	return rdev_probe_mesh_link(rdev, dev, dest, buf, len);
 }