P2P: Fix p2p_ctrl_invite_persistent() to parse peer parameter

Commit 4d32c0c44db43d496f45c5094a9b6ae60c35115e added another use for the
local pos variable and that broke the mechanism used to determine wheter
the peer address was provided. Fix this by using a separate pointer to the
peer address.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/ctrl_iface.c

@@ -3520,7 +3520,7 @@ static int p2p_ctrl_invite_persistent(struct wpa_supplicant *wpa_s, char *cmd)
 	char *pos;
 	int id;
 	struct wpa_ssid *ssid;
-	u8 peer[ETH_ALEN];
+	u8 *_peer = NULL, peer[ETH_ALEN];
 	int freq = 0;
 	int ht40;
 
@@ -3530,6 +3530,7 @@ static int p2p_ctrl_invite_persistent(struct wpa_supplicant *wpa_s, char *cmd)
 		pos += 6;
 		if (hwaddr_aton(pos, peer))
 			return -1;
+		_peer = peer;
 	}
 	ssid = wpa_config_get_network(wpa_s->conf, id);
 	if (ssid == NULL || ssid->disabled != 2) {
@@ -3549,8 +3550,7 @@ static int p2p_ctrl_invite_persistent(struct wpa_supplicant *wpa_s, char *cmd)
 
 	ht40 = os_strstr(cmd, " ht40") != NULL;
 
-	return wpas_p2p_invite(wpa_s, pos ? peer : NULL, ssid, NULL, freq,
-			       ht40);
+	return wpas_p2p_invite(wpa_s, _peer, ssid, NULL, freq, ht40);
 }