Function mbedtls_sys::mbedtls_ssl_conf_psk_cb

pub unsafe extern "C" fn mbedtls_ssl_conf_psk_cb(
    conf: *mut mbedtls_ssl_config, 
    f_psk: Option<unsafe extern "C" fn(_: *mut c_void, _: *mut mbedtls_ssl_context, _: *const c_uchar, _: size_t) -> c_int>, 
    p_psk: *mut c_void
)