Igor Canadi d5de22dc09 Call PurgeObsoleteFiles() only when HaveSomethingToDelete()
Summary: as title

Test Plan: fixed the build failure http://ci-builds.fb.com/job/rocksdb_build/987/console

Reviewers: haobo

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16743
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