Omudpspoof source ports are not generated properly

Here was a bugfix at 4ae292e664260f148e7da6c1641d1490c059371e. It is apparently wrong for source ports, because they were in host order already.

Also here is minor cleanup of compiler warnings (size_t vs %d). Strictly speaking, all this should be converted to size_t, but, as far as I googled, proper printf format for size_t is not well settled yet.