DPP: Remove obsolete TODO comment on discovery object

The optional channel information was removed from the discovery object
in the DPP tech spec, so no need to maintain this TODO note anymore.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/common/dpp.c

@@ -3435,9 +3435,7 @@ dpp_build_conf_start(struct dpp_authentication *auth,
 	json_escape_string(ssid, sizeof(ssid),
 			   (const char *) conf->ssid, conf->ssid_len);
 	wpabuf_put_str(buf, ssid);
-	wpabuf_put_str(buf, "\"");
-	/* TODO: optional channel information */
-	wpabuf_put_str(buf, "},");
+	wpabuf_put_str(buf, "\"},");
 
 	return buf;
 }