Remove non-existent adapter_is_ready prototype
diff --git a/src/adapter.h b/src/adapter.h
index 4fe0674..29eb3f2 100644
--- a/src/adapter.h
+++ b/src/adapter.h
@@ -133,7 +133,6 @@
 void adapter_set_state(struct btd_adapter *adapter, int state);
 int adapter_get_state(struct btd_adapter *adapter);
 int adapter_get_discover_type(struct btd_adapter *adapter);
-gboolean adapter_is_ready(struct btd_adapter *adapter);
 struct remote_dev_info *adapter_search_found_devices(struct btd_adapter *adapter,
 						struct remote_dev_info *match);
 void adapter_update_device_from_info(struct btd_adapter *adapter,