dhcpd: remember and record hostnames; optimize get_option

dumpleases: show hostnames

function                                             old     new   delta
add_lease                                            230     292     +62
send_offer                                           403     421     +18
send_ACK                                             232     249     +17
read_leases                                          249     258      +9
dumpleases_main                                      604     609      +5
nobody_responds_to_arp                                84      86      +2
udhcp_end_option                                      32      30      -2
udhcp_get_option                                     222     171     -51
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/2 up/down: 113/-53)            Total: 60 bytes

1 files changed, 1 insertions, 1 deletions

diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index fb6fe01ae..a061a9c9b 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -420,7 +420,7 @@ void FAST_FUNC read_leases(const char *file)
                                 continue;
                         /* NB: add_lease takes "relative time", IOW,
                          * lease duration, not lease deadline. */
-                        if (!(add_lease(lease.chaddr, lease.yiaddr, expires))) {
+                        if (!(add_lease(lease.chaddr, lease.yiaddr, expires, lease.hostname))) {
                                 bb_error_msg("too many leases while loading %s", file);
                                 break;
                         }