Fix typo

[abxhr]

Fixes #2740

This PR fixes a small typo in this line of zstd/lib/zstd.h

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[terrelln]

Thanks for the PR @abxhr, it looks good to me! Once you sign the CLA we can merge it!

[abxhr]

I've signed the CLA. I guess it might take a few minutes for the confirmation.

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