wifi: nl80211: don't give key data to userspace

When a key is requested by userspace, there's really no need
to include the key data, the sequence counter is really what
userspace needs in this case. The fact that it's included is
just a historic quirk.

Remove the key data.
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240627104411.b6a4f097e4ea.I7e6cc976cb9e8a80ef25a3351330f313373b4578@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -4487,10 +4487,7 @@ static void get_key_callback(void *c, struct key_params *params)
 	struct nlattr *key;
 	struct get_key_cookie *cookie = c;
 
-	if ((params->key &&
-	     nla_put(cookie->msg, NL80211_ATTR_KEY_DATA,
-		     params->key_len, params->key)) ||
-	    (params->seq &&
+	if ((params->seq &&
 	     nla_put(cookie->msg, NL80211_ATTR_KEY_SEQ,
 		     params->seq_len, params->seq)) ||
 	    (params->cipher &&
@@ -4502,10 +4499,7 @@ static void get_key_callback(void *c, struct key_params *params)
 	if (!key)
 		goto nla_put_failure;
 
-	if ((params->key &&
-	     nla_put(cookie->msg, NL80211_KEY_DATA,
-		     params->key_len, params->key)) ||
-	    (params->seq &&
+	if ((params->seq &&
 	     nla_put(cookie->msg, NL80211_KEY_SEQ,
 		     params->seq_len, params->seq)) ||
 	    (params->cipher &&