Function mbuf_ancillary_data_is_string 

pub unsafe extern "C" fn mbuf_ancillary_data_is_string(
    data: *mut mbuf_ancillary_data,
) -> bool

Check if an ancillary data contains a string value.

If this function returns true, then mbuf_ancillary_data_get_string(data) will return a valid c-string pointer.

@param data: The ancillary data.

@return true if data contains a string value, false otherwise.