utilities: Fix coverity issues
Summary: ``` utilities/persistent_cache/block_cache_tier_file.cc 64struct CacheRecordHeader { 2. uninit_member: Non-static class member magic_ is not initialized in this constructor nor in any functions that it calls. 4. uninit_member: Non-static class member crc_ is not initialized in this constructor nor in any functions that it calls. 6. uninit_member: Non-static class member key_size_ is not initialized in this constructor nor in any functions that it calls. CID 1396161 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR) 8. uninit_member: Non-static class member val_size_ is not initialized in this constructor nor in any functions that it calls. 65 CacheRecordHeader() {} 66 CacheRecordHeader(const uint32_t magic, const uint32_t key_size, 67 const uint32_t val_size) 68 : magic_(magic), crc_(0), key_size_(key_size), val_size_(val_size) {} 69 1. member_decl: Class member declaration for magic_. 70 uint32_t magic_; 3. member_decl: Class member declaration for crc_. 71 uint32_t crc_; 5. member_decl: Class member declaration for key_size_. 72 uint32_t key_size_; 7. member_decl: Class member declaration for val_size_. 73 uint32_t val_size_; 74}; utilities/simulator_cache/sim_cache.cc: 157 miss_times_(0), CID 1396124 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR) 2. uninit_member: Non-static class member stats_ is not initialized in this constructor nor in any functions that it calls. 158 hit_times_(0) {} 159 ``` Closes https://github.com/facebook/rocksdb/pull/3155 Differential Revision: D6427237 Pulled By: sagar0 fbshipit-source-id: 97e493da5fc043c5b9a3e0d33103442cffb75aad
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