Use PCI_HOST_BRIDGE macro

OBJECT_CHECK(PciHostState, ..., TYPE_PCI_HOST_BRIDGE) is exactly
what the PCI_HOST_BRIDGE macro does.  We can just use the macro
instead of using OBJECT_CHECK manually.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210805193431.307761-7-ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/i386/acpi-build.c

@@ -303,13 +303,9 @@ Object *acpi_get_i386_pci_host(void)
 {
     PCIHostState *host;
 
-    host = OBJECT_CHECK(PCIHostState,
-                        object_resolve_path("/machine/i440fx", NULL),
-                        TYPE_PCI_HOST_BRIDGE);
+    host = PCI_HOST_BRIDGE(object_resolve_path("/machine/i440fx", NULL));
     if (!host) {
-        host = OBJECT_CHECK(PCIHostState,
-                            object_resolve_path("/machine/q35", NULL),
-                            TYPE_PCI_HOST_BRIDGE);
+        host = PCI_HOST_BRIDGE(object_resolve_path("/machine/q35", NULL));
     }
 
     return OBJECT(host);

hw/pci-host/i440fx.c

@@ -316,9 +316,7 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
 
 PCIBus *find_i440fx(void)
 {
-    PCIHostState *s = OBJECT_CHECK(PCIHostState,
-                                   object_resolve_path("/machine/i440fx", NULL),
-                                   TYPE_PCI_HOST_BRIDGE);
+    PCIHostState *s = PCI_HOST_BRIDGE(object_resolve_path("/machine/i440fx", NULL));
     return s ? s->bus : NULL;
 }