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/display/cirrus_vga_isa.c b/hw/display/cirrus_vga_isa.c
index e6adee1..4f6fb1a 100644
--- a/hw/display/cirrus_vga_isa.c
+++ b/hw/display/cirrus_vga_isa.c
@@ -33,9 +33,7 @@
 #include "qom/object.h"
 
 #define TYPE_ISA_CIRRUS_VGA "isa-cirrus-vga"
-typedef struct ISACirrusVGAState ISACirrusVGAState;
-DECLARE_INSTANCE_CHECKER(ISACirrusVGAState, ISA_CIRRUS_VGA,
-                         TYPE_ISA_CIRRUS_VGA)
+OBJECT_DECLARE_SIMPLE_TYPE(ISACirrusVGAState, ISA_CIRRUS_VGA)
 
 struct ISACirrusVGAState {
     ISADevice parent_obj;