proper way of handling [out,retval] VARIANT * args

Oh wise masters of COM:

what's the proper way to handle an [out,retval] VARIANT *arg ?
Do you use VariantInit() after checking for a null arg, or
VariantClear?

STDMETHODIMP CBlah::get_something(VARIANT *pVal)
{
if (pVal == NULL)
return E_POINTER;

VariantInit(pVal);

// do some stuff, it may return an error

// everything is great, assign the VARIANT
CComBSTR b = L"something from blah";
V_VT(pVal) = VT_BSTR;
V_BSTR(pVal) = b.Detach();
return S_OK;
}

.

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