fix use-after-free error involving a temporary string (#4240)
Summary: In the current code, `error_msg` is pointing to the inner buffer of a temporary std::string object. When `error_msg` is used to construct the error message, that array is already released. This PR will fix this bug by copying the string to a local variable. Fixes https://github.com/facebook/rocksdb/issues/4239 Pull Request resolved: https://github.com/facebook/rocksdb/pull/4240 Differential Revision: D9204334 Pulled By: miasantreble fbshipit-source-id: 0ac599e166ae0a4ec413e32d8b8853d7c5fba878
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