Presumably the intent is to dump *non*-dummy entries.

I.e., presumably the intent is to dump *resolved* hosts, rather than
*unresolved* hosts where there's no known host name and the name field
is a string form of the address (the premise being that looking the
address up in the hash table repeatedly, and using the already-generated
string, will be faster than generating the string repeatedly).

Change-Id: I3becf1661fe88548f8ffcf255d3d438f456dcbda
Reviewed-on: https://code.wireshark.org/review/5453
Reviewed-by: Guy Harris <guy@alum.mit.edu>