algo/cholesky: remove useless PINOCCHIO_UNUSED_VARIABLE

20 jobs for topic/fcl-release in 191 minutes and 50 seconds (queued for 1 second)
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robotpkg-py-pinocchio-py3-16.04-release Test
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robotpkg-py-pinocchio-py3-14.04-debug Test
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robotpkg-py-pinocchio-py3-14.04-release Test
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robotpkg-py-pinocchio-py3-16.04-debug Test
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