Lucian Grijincu a756fb9c85 rocksdb: don't call LZ4_loadDictHC with null dictionary
Summary: UBSAN revealed a pointer underflow when `LZ4HC_init_internal` is called with a null `start`.

Reviewed By: ajkr

Differential Revision: D30181874

fbshipit-source-id: ca9bbac1a85c58782871d7f153af733b000cc66c
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