chg: fix an undefined behavior about memcpy Spot by Wez Furlong. `memcpy(x, NULL, 0)` is undefined according to [1]. [1]: https://stackoverflow.com/questions/5243012 Differential Revision: https://phab.mercurial-scm.org/D3698

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# See http://EditorConfig.org for the specification

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root = true

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[*.py]

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indent_size = 4

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indent_style = space

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trim_trailing_whitespace = true

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[*.{c,h}]

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indent_size = 8

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indent_style = tab

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trim_trailing_whitespace = true