DragonFlyBSD/src 722c3b8test/cocci useful_macros.cocci

useful_macros.cocci: Improve a bit.

Submitted-by: Markus Elfring

https://github.com/DragonFlyBSD/DragonFlyBSD/commit/194bb2afcef86db2c8a0a56b7d8527aa3eb01fb0#commitcomment-35885096
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+45-121test/cocci/useful_macros.cocci
+45-1211 files

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