Use OBJECT_DECLARE_SIMPLE_TYPE when possible

This converts existing DECLARE_INSTANCE_CHECKER usage to
OBJECT_DECLARE_SIMPLE_TYPE when possible.

$ ./scripts/codeconverter/converter.py -i \
  --pattern=AddObjectDeclareSimpleType $(git grep -l '' -- '*.[ch]')

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Paul Durrant <paul@xen.org>
Message-Id: <20200916182519.415636-6-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/hw/usb/dev-audio.c b/hw/usb/dev-audio.c
index 65247ca..e1486f8 100644
--- a/hw/usb/dev-audio.c
+++ b/hw/usb/dev-audio.c
@@ -654,11 +654,9 @@
     uint32_t buffer_user, buffer;
     bool multi;
 };
-typedef struct USBAudioState USBAudioState;
 
 #define TYPE_USB_AUDIO "usb-audio"
-DECLARE_INSTANCE_CHECKER(USBAudioState, USB_AUDIO,
-                         TYPE_USB_AUDIO)
+OBJECT_DECLARE_SIMPLE_TYPE(USBAudioState, USB_AUDIO)
 
 static void output_callback(void *opaque, int avail)
 {