[clang-tidy] Correcting fix suggestion in `readability-simplify-boolean-expr` (#178392)
When the checker `readability-simplify-boolean-expr` is used on C23
code, where the `bool` type is provided but not `static_cast`, the fixer
suggests faulty code.
```
bool negative_condition_conditional_return_statement(int i) {
if (!(i == 0)) return false; else return true;
}
/xx/llvm-project/build/../clang-tools-extra/test/clang-tidy/checkers/readability/simplify-boolean-expr-c23.c:323:25: warning: redundant boolean literal in conditional return statement [readability-simplify-boolean-expr]
323 | if (!(i == 0)) return false; else return true;
| ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
| return static_cast<bool>(i == 0)
```
Let's skip the use of `static_cast` for C code where a cast is not
needed.
---------
Signed-off-by: Björn Svensson <bjorn.a.svensson@est.tech>
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