Zhongyi Xie b3efb1cbe0 fix clang analyzer warnings (#4072)
Summary:
clang analyze is giving the following warnings:
> db/compaction_job.cc:1178:16: warning: Called C++ object pointer is null
    } else if (meta->smallest.size() > 0) {
               ^~~~~~~~~~~~~~~~~~~~~
db/compaction_job.cc:1201:33: warning: Access to field 'marked_for_compaction' results in a dereference of a null pointer (loaded from variable 'meta')
    meta->marked_for_compaction = sub_compact->builder->NeedCompact();
    ~~~~
db/version_set.cc:2770:26: warning: Called C++ object pointer is null
        uint32_t cf_id = last_writer->cfd->GetID();
                         ^~~~~~~~~~~~~~~~~~~~~~~~~
Closes https://github.com/facebook/rocksdb/pull/4072

Differential Revision: D8685852

Pulled By: miasantreble

fbshipit-source-id: b0e2fd9dfc1cbba2317723e09886384b9b1c9085
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