libbb: add strncpy_IFNAMSIZ

function                                             old     new   delta
...
udhcp_read_interface                                 225     220      -5
brctl_main                                          1151    1146      -5
add_interface                                        109     104      -5
ipaddr_list_or_flush                                2174    2167      -7
do_add_ioctl                                          88      80      -8
vconfig_main                                         249     240      -9
do_del_ioctl                                          78      68     -10
do_iplink                                           1186    1173     -13
do_if_fetch                                          766     753     -13
buffer_fill_and_print                                196     179     -17
parse_args                                          1709    1684     -25
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/20 up/down: 11/-140)         Total: -129 bytes

1 files changed, 1 insertions, 1 deletions

diff --git a/networking/ifconfig.c b/networking/ifconfig.c
index e999741d1..22b1682bc 100644
--- a/networking/ifconfig.c
+++ b/networking/ifconfig.c
@@ -313,7 +313,7 @@ int ifconfig_main(int argc, char **argv)
         sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 
         /* get interface name */
-        strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
+        strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
 
         /* Process the remaining arguments. */
         while (*++argv != (char *) NULL) {