doc: ZSTD_free*() functions accept NULL pointer #2521
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ZSTD_free*()functions acceptNULLpointer, it would be nice to state in doc.I generated HTML doc with
gen_htmltool and checked them.Related code for review:
ZSTD_freeCCtx
https://github.com/facebook/zstd/blob/v1.4.9/lib/compress/zstd_compress.c#L161-L163
ZSTD_freeDCtx
https://github.com/facebook/zstd/blob/v1.4.9/lib/decompress/zstd_decompress.c#L310-L312
ZSTD_freeCStream
https://github.com/facebook/zstd/blob/v1.4.9/lib/compress/zstd_compress.c#L4045-L4048
ZSTD_freeDStream
https://github.com/facebook/zstd/blob/v1.4.9/lib/decompress/zstd_decompress.c#L1510-L1513
ZSTD_freeCDict
https://github.com/facebook/zstd/blob/v1.4.9/lib/compress/zstd_compress.c#L3866-L3868
ZSTD_freeDDict
https://github.com/facebook/zstd/blob/v1.4.9/lib/decompress/zstd_ddict.c#L212-L214
ZSTD_freeThreadPool
https://github.com/facebook/zstd/blob/v1.4.9/lib/common/pool.c#L180-L193
ZSTD_freeCCtxParams
https://github.com/facebook/zstd/blob/v1.4.9/lib/compress/zstd_compress.c#L253-L255