Fix Clang static analyzer warning in db_bench (#4910)
Summary: Fixed clang static analyzer warning about division by 0. ``` ar: creating librocksdb_debug.a tools/db_bench_tool.cc:4650:43: warning: Division by zero int pos = static_cast<int>(rand_num % range_); ~~~~~~~~~^~~~~~~~ 1 warning generated. make: *** [analyze] Error 1 ``` This is from the new code I recently merged in ce8e88d2. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4910 Differential Revision: D13788037 Pulled By: sagar0 fbshipit-source-id: f48851dca85047c19fbb1a361e25ce643aa4c7ea
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