bt: use qemu_chr_alloc()
Use common allocator for CharDriverState. Rename the now untouched parent field. The casts added are temporary, they are replaced with QOM type-safe macros in a later patch in this series. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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