add zero uuid instance

include/uuid.h

@@ -53,6 +53,8 @@ CLASS(Uuid) {
 	} uuid;
 };
 
+extern Uuid uuidZero;
+
 /*
  * generator functions...these are not really part of the object
  * but generate a uuid object.

src/uuid/uuid.c

@@ -53,4 +53,8 @@ uuidClone(void * _this, void * _base)
 INIT_IFACE(Class, uuidCtor, uuidDtor, uuidClone);
 CREATE_CLASS(Uuid, NULL, IFACE(Class));
 
+INSTANCE(Uuid, uuidZero) {
+	.uuid.value = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
+}};
+
 // vim: set ts=4 sw=4: