Andrew Kryczka 19fde54841 initialize local variable for UBSAN in PosixEnv function
Summary:
this is a repeat commit of a8a28da2159648a2f72c35ea507371df8a97a2a9, which got reverted together with 6afe22db2e667799d8c903db61750d676bffe152, but forgotten about when that commit was un-reverted in 46152d53bf58748fc3ed0681d8970c342bcfc47a.
Closes https://github.com/facebook/rocksdb/pull/3796

Differential Revision: D7826077

Pulled By: ajkr

fbshipit-source-id: edb22375da56e2feda50c5b35f942f4d2d52b19c
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