QOM: Fail casts for unknown types
When we try to cast an object to an unknown type, fail the cast. Today we would simply run into an assert(). This fixes a bug on qemu-system-s390x for me that gets triggered by the audio code looking for PCI and ISA buses. Signed-off-by: NAlexander Graf <agraf@suse.de> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Message-id: 1367326936-28539-1-git-send-email-agraf@suse.de Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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