*: use llist_pop for traverse-and-free list operation

function                                             old     new   delta
append_file_list_to_list                             109     111      +2
udhcpc_main                                         2414    2413      -1
run_parts_main                                       325     324      -1
od_main                                             2324    2323      -1
getopt_main                                          709     707      -2
env_main                                             253     251      -2
sed_main                                             659     656      -3
ps_main                                              522     519      -3
traceroute_main                                     3960    3954      -6
sort_main                                            844     838      -6
diff_main                                            866     858      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/10 up/down: 2/-33)            Total: -31 bytes

1 files changed, 1 insertions, 2 deletions

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 655d39fd2..5eb1ed5fd 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -259,12 +259,11 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
         if (opt & OPT_o)
                 client_config.no_default_options = 1;
         while (list_O) {
-                int n = index_in_strings(dhcp_option_strings, list_O->data);
+                int n = index_in_strings(dhcp_option_strings, llist_pop(&list_O));
                 if (n < 0)
                         bb_error_msg_and_die("unknown option '%s'", list_O->data);
                 n = dhcp_options[n].code;
                 client_config.opt_mask[n >> 3] |= 1 << (n & 7);
-                list_O = list_O->link;
         }
 
         if (read_interface(client_config.interface, &client_config.ifindex,