Function xcb::ffi::xkb::xcb_xkb_get_map_map_vmodmap_rtrn_length

pub unsafe extern fn xcb_xkb_get_map_map_vmodmap_rtrn_length(
    R: *const xcb_xkb_get_map_reply_t, 
    S: *const xcb_xkb_get_map_map_t
) -> c_int