qom: Constify TypeInfo::interfaces

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20250424194905.82506-6-philmd@linaro.org>

hw/scsi/megasas.c

@@ -2486,7 +2486,7 @@ typedef struct MegasasInfo {
     const VMStateDescription *vmsd;
     const Property *props;
     size_t props_count;
-    InterfaceInfo *interfaces;
+    const InterfaceInfo *interfaces;
 } MegasasInfo;
 
 static struct MegasasInfo megasas_devices[] = {

include/hw/virtio/virtio-pci.h

@@ -256,7 +256,7 @@ typedef struct VirtioPCIDeviceTypeInfo {
     void (*instance_init)(Object *obj);
     void (*instance_finalize)(Object *obj);
     void (*class_init)(ObjectClass *klass, const void *data);
-    InterfaceInfo *interfaces;
+    const InterfaceInfo *interfaces;
 } VirtioPCIDeviceTypeInfo;
 
 /* Register virtio-pci type(s).  @t must be static. */

include/qom/object.h

@@ -490,7 +490,7 @@ struct TypeInfo
     void (*class_base_init)(ObjectClass *klass, const void *data);
     const void *class_data;
 
-    InterfaceInfo *interfaces;
+    const InterfaceInfo *interfaces;
 };
 
 /**

rust/qemu-api/src/qom.rs

@@ -514,7 +514,7 @@ pub trait ObjectImpl: ObjectType + IsA<Object> {
         class_init: Some(rust_class_init::<Self>),
         class_base_init: Self::CLASS_BASE_INIT,
         class_data: core::ptr::null(),
-        interfaces: core::ptr::null_mut(),
+        interfaces: core::ptr::null(),
     };
 
     // methods on ObjectClass