Slightly faster version of vacuumlo

Hello all,

I tried to use vacuumlo on quite big database with large objects (approx 20000-30000).
And I found out that it will take 5-6 hours to cleanup blobs even when there's no unlinked ones.
I've looked inside the code and added some improvements.
Now it took 20-30 seconds to complete.

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Sincerely Yours,
Denis Perchine

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