use "0" instead of "false"

otherwise compilation breaks when using a C90 compiler

src/util/list.c

@@ -111,7 +111,7 @@ void list_remove(struct linked_list* list, void* data_ptr)
 		}
 		node = node->next;
 	}
-	uhub_assert(false);
+	uhub_assert(0);
 }