[clang-tidy] False negative readability-redundant-casting with function pointer

[chrchr-github]

int f();
int g() {
    int (*fp)() = (int(*)())f; // redundant cast
    return fp();
}

https://godbolt.org/z/h8brsnq4z

[llvmbot]

@llvm/issue-subscribers-clang-tidy

Author: None (chrchr-github)

~~~c++ int f(); int g() { int (*fp)() = (int(*)())f; // redundant cast return fp(); } ~~~ https://godbolt.org/z/h8brsnq4z

[HerrCai0907]

Actually f's typing is int (void) but cast to int(*)(void). So theoretically, it is not redundant casting.
But even we use &f, tidy still have false neg. https://godbolt.org/z/1PM5qz8vY