Filip Krska's patch to abort the current pass after poll() returns when
we've given it an indefinite timeout.

--- krb5/src/lib/krb5/os/sendto_kdc.c
+++ krb5/src/lib/krb5/os/sendto_kdc.c
@@ -529,6 +529,8 @@ cm_select_or_poll(const struct select_st
     *out = *in;
     *sret = poll(out->fds, out->nfds, timeout);
     e = SOCKET_ERRNO;
+    if (timeout < 0)
+        return e;
     return (*sret < 0) ? e : 0;
 #else
     /* Use the select wrapper from cm.c. */