[clang-tools-extra] [clang-tidy] Correcting fix suggestion in `readability-simplify-boolean-expr` (PR #178392)

[Björn Svensson via cfe-commits]

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@@ -162,7 +162,8 @@ static std::string replacementExpression(const ASTContext &Context,
   if (const auto *EC = dyn_cast<ExprWithCleanups>(E))
     E = EC->getSubExpr();
 
-  const bool NeedsStaticCast = needsStaticCast(E);
+  const bool NeedsStaticCast =
+      Context.getLangOpts().CPlusPlus && needsStaticCast(E);
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bjosv wrote:

Also, `bool` is an integer type in C23 ([6.3.1.1](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3220.pdf) in the public draft),and

all integer types can be implicitly converted to other integer types under the standard conversion rules (§6.3),
then converting from bool to an integer type (e.g., int, unsigned, etc.) does not require an explicit cast according to the normal conversion model of the language.

https://github.com/llvm/llvm-project/pull/178392