D-Bus: Make WPAS_DBUS_TYPE_BINARRAY value less confusing

Commit 911e97e4002019e577bb1086f1fd02daff978544 ('DBus: Refactor array
adding, add binary arrays') introduced WPAS_DBUS_TYPE_BINARRAY as an
internal fake type for array_type. However, it selected this value to be
(DBUS_NUMBER_OF_TYPES + 100) = 116 = 't'. This happens to conflict with
DBUS_TYPE_UINT64 ((int) 't'). While none of the existing array_type use
cases supported UINT64, it is much clearer if WPAS_DBUS_TYPE_BINARRAY
has a value that does not match any existing DBUS_TYPE_* value. Replace
this with '@' (64).

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

wpa_supplicant/dbus/dbus_dict_helpers.h

@@ -120,7 +120,11 @@ dbus_bool_t wpa_dbus_dict_append_wpabuf_array(DBusMessageIter *iter_dict,
  * Reading a dict from a DBusMessage
  */
 
-#define WPAS_DBUS_TYPE_BINARRAY (DBUS_NUMBER_OF_TYPES + 100)
+/*
+ * Used only in struct wpa_dbus_dict_entry::array_type internally to identify
+ * special binary array case.
+ */
+#define WPAS_DBUS_TYPE_BINARRAY ((int) '@')
 
 struct wpa_dbus_dict_entry {
 	int type;         /** the dbus type of the dict entry's value */