qom: object: Ignore refs/unrefs of NULL
Just do nothing if passed NULL for a ref or unref. This avoids call sites that manage a combination of NULL or non-NULL pointers having to add iffery around every ref and unref. Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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