In latest iptables SVN, the command:

iptables -A foo -p tcp -m multiport --dport 45,47 -m multiport --sport 45:48

ends up with mangled results of:

... multiport sports  multiport sports  tcp spts:45:48

Since at present, iptables can only handle one match of a given type
per rule.  The below patch makes sure we disallow more than one.

This closes bugzilla #447

Phil