Function nginx::BIO_dump_indent_cb

pub unsafe extern "C" fn BIO_dump_indent_cb(
    cb: Option<unsafe extern "C" fn(data: *const c_void, len: size_t, u: *mut c_void) -> c_int>, 
    u: *mut c_void, 
    s: *const c_char, 
    len: c_int, 
    indent: c_int
) -> c_int