Fix ASAN failure with backupable DB
Summary: It looks like ASAN with gcc 4.9 works better than 4.8.1. It detected this possibility of heap buffer overflow. This was in our codebase for a year :) Test Plan: COMPILE_WITH_ASAN=1 make backupable_db && ./backupable_db Reviewers: yhchiang, rven, sdong Reviewed By: sdong Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D32085
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