Don't call the meaningless gettoppts if we're doing a ping or list scan. This

keeps the following debugging line from being printed in these modes:

	PORTS: Using top 1000 ports found open (TCP:0, UDP:0)

This also speeds these up because it doesn't necessarily have to read and parse
nmap-services.  Going from 0.25s to 0.04s for listing a /24 sounds good to me :)

nmap.cc

@@ -1347,7 +1347,7 @@ int nmap_main(int argc, char *argv[]) {
   if (o.ipprotscan) {
 	  if (portlist) getpts(portlist, &ports);
 	  else getpts((char *) (o.fastscan ? "[P:0-]" : "0-"), &ports);  // Default protocols to scan
-  } else {
+  } else if (!o.pingscan && !o.listscan) {
     gettoppts(o.topportlevel, portlist, &ports);
   }