Do the right check for "no name resolution information to save".

The check that the pcapng code does is "do we have a non-null
addrinfo_lists_t * and, if so, does it have a non-null ipv4_addr_list or
ipv6_addr_list"?

The check that the file-save code was using was just "do we have a
non-null addrinfo_lists_t *", so sometimes it'd think we couldn't do a
"quick save" even though we had no name resolution information to write
out to the capture file.

Make a routine that does that check, and use it in *both* places.

Change-Id: Id4720f4fe4940354320b2b7621ca5e37e45ec1f3
Reviewed-on: https://code.wireshark.org/review/25055
Reviewed-by: Guy Harris <guy@alum.mit.edu>

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