[clang-tools-extra] [clang-tidy][NFC] Remove hack in readability-implicit-bool-conversion testcases (PR #188399)

[Zeyi Xu via cfe-commits]

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@@ -1,13 +1,10 @@
-// RUN: %check_clang_tidy %s readability-implicit-bool-conversion %t
-// RUN: %check_clang_tidy -check-suffix=UPPER-CASE %s readability-implicit-bool-conversion %t -- \
+// RUN: %check_clang_tidy %s readability-implicit-bool-conversion %t -- --system-headers
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zeyi2 wrote:

> Is it maybe because the attached note that shows where the NULL macro is defined points into a system header?

I believe so, hopefully it won't be too hard to fix.

https://github.com/llvm/llvm-project/pull/188399