dhcp packet size fix (aka pump fix)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@888 c046a42c-6fe2-441c-8c8c-71466251a162

slirp/bootp.c

@@ -225,7 +225,8 @@ static void bootp_reply(struct bootp_t *bp)
     }
     *q++ = RFC1533_END;
     
-    m->m_len = sizeof(struct bootp_t);
+    m->m_len = sizeof(struct bootp_t) - 
+        sizeof(struct ip) - sizeof(struct udphdr);
     udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
 }