How to remove the Option in generated function pointer?

[nomi-san]

Is there a way to remove the Option<> in the generated code of function pointer member in struct?

Input C/C++ Header

struct Okela {
  int *some_ptr;
  int (*get_some_val)(int a, int b);
};

Actual Results

pub struct Okela {
    pub some_ptr: *mut i32,
    pub get_some_val: ::std::option::Option<
        unsafe extern "C" fn(a: ::std::os::raw::c_int, b: ::std::os::raw::c_int),
    >,
}

Expected Results

...
    pub get_some_val: unsafe extern "C" fn(a: ::std::os::raw::c_int, b: ::std::os::raw::c_int),

[pvdrz]

duplicated of #1278