Some objects accidentally inherit ObjectClass instead of Object.
They compile silently but may crash after downcasting.

In this patch, we introduce a coccinelle script to find broken
declarations and fix them manually with proper base type.

Signed-off-by: Sergey Nizovtsev <snizovtsev@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>