insmod: shrink

function                                             old     new   delta
obj_allocate_commons                                 488     462     -26
insmod_main                                         3830    3714    -116

diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 5caa00c..92ebe36 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -259,9 +259,10 @@
 	if (opt & OPT_o)
 		client_config.no_default_options = 1;
 	while (list_O) {
-		int n = index_in_strings(dhcp_option_strings, llist_pop(&list_O));
+		char *optstr = llist_pop(&list_O);
+		int n = index_in_strings(dhcp_option_strings, optstr);
 		if (n < 0)
-			bb_error_msg_and_die("unknown option '%s'", list_O->data);
+			bb_error_msg_and_die("unknown option '%s'", optstr);
 		n = dhcp_options[n].code;
 		client_config.opt_mask[n >> 3] |= 1 << (n & 7);
 	}