[Bug 237843] arp: Skips all name lookups if first fail with TRY_AGAIN

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237843

--- Comment #3 from pete at twisted.org.uk ---
Wasn't supposed to be a patch, as its not a real fix - its removing intended
functionality to let me debug what was going on, which is not a great way to
proceed, but for reference the diff looks like this:

--- arp.c       2019-05-12 10:20:57.920473000 +0100
+++ /usr/src/usr.sbin/arp/arp.c 2018-11-11 17:59:35.794752000 +0000
@@ -605,8 +605,11 @@
                hp = 0;
        if (hp)
                host = hp->h_name;
-       else
+       else {
                host = "?";
+               if (h_errno == TRY_AGAIN)
+                       nflag = 1;
+       }
        xo_emit("{:hostname/%s} ({:ip-address/%s}) at ", host,
            inet_ntoa(addr->sin_addr));
        if (sdl->sdl_alen) {

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