Fixup a memory access fault on an invalid reply. Quoting the spec:

    The host driver must ensure that there is at least one
    unused entry in the Reply Free Queue. One way to ensure
    that this requirement is met is to never allocate a number
    of reply frames that is a multiple of 16.

So bring back the old logic of calculating the RFQ depth and add a
comment explaining why is it done.  Duh!

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