db_bench: explicitly clear buffer in compress benchmark
Summary: It is reported that in compress benchmark in db_bench, zlib will cause an OOM. The suggestd fix was to clear the buffer. Test Plan: Build and run compress benchmark. Reviewers: IslamAbdelRahman, yhchiang, rven, andrewkr, kradhakrishnan, anthony Reviewed By: anthony Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D52857
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