Fix an uninitialized variable warning for g++ 12.2.0 (#10995)

Fix an uninitialized variable warning for g++ 12.2.0 (#10995)

Summary:
/home/wl/rocksdbtry/rocksdb-WL/util/bloom_test.cc: In constructor ‘rocksdb::RawFilterTester::RawFilterTester()’:
/home/wl/rocksdbtry/rocksdb-WL/util/bloom_test.cc:813:40: error: member ‘rocksdb::RawFilterTester::data_’ is used uninitialized [-Werror=uninitialized]

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10995

Reviewed By: cbi42

Differential Revision: D41620186

Pulled By: ajkr

fbshipit-source-id: a6ebd3820ef12e0af322cbfb7eb553de5bdfcb29