fix FTBFS due to superfluous usage of macro

Fixes: 49194fe9cd15 ("fix missing usage of declaration macro")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
diff --git a/src/hinawa.h b/src/hinawa.h
index be4d8c4..b690f62 100644
--- a/src/hinawa.h
+++ b/src/hinawa.h
@@ -2,8 +2,6 @@
 #ifndef __ALSA_HINAWA_H__
 #define __ALSA_HINAWA_H__
 
-G_BEGIN_DECLS
-
 #include <glib.h>
 #include <glib-object.h>
 
@@ -30,6 +28,4 @@
 #include <snd_motu.h>
 #include <snd_tscm.h>
 
-G_END_DECLS
-
 #endif