*: s/IF_NAMESIZE/IFNAMSIZ/, regularize its use a bit.

function                                             old     new   delta
strncpy_IFNAMSIZ                                       -      13     +13
set_slave_mtu                                         39      37      -2
set_slave_hwaddr                                      52      50      -2
set_master_hwaddr                                     52      50      -2
set_if_flags                                          40      38      -2
get_if_settings                                      101      98      -3
ifenslave_main                                      1680    1661     -19
vconfig_main                                         306     280     -26
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/7 up/down: 13/-56)            Total: -43 bytes

1 files changed, 4 insertions, 9 deletions

diff --git a/networking/nameif.c b/networking/nameif.c
index afc88917e..f3d333baf 100644
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -16,16 +16,11 @@
 #include <netinet/ether.h>
 #include <linux/sockios.h>
 
-/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
-#ifndef IF_NAMESIZE
-#  ifdef IFNAMSIZ
-#    define IF_NAMESIZE IFNAMSIZ
-#  else
-#    define IF_NAMESIZE 16
-#  endif
+#ifndef IFNAMSIZ
+#define IFNAMSIZ 16
 #endif
 
-/* take from linux/sockios.h */
+/* Taken from linux/sockios.h */
 #define SIOCSIFNAME     0x8923  /* set interface name */
 
 /* Octets in one Ethernet addr, from <linux/if_ether.h> */
@@ -111,7 +106,7 @@ static void nameif_parse_selector(ethtable_t *ch, char *selector)
 static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
 {
         ethtable_t *ch;
-        if (strlen(ifname) >= IF_NAMESIZE)
+        if (strlen(ifname) >= IFNAMSIZ)
                 bb_error_msg_and_die("interface name '%s' too long", ifname);
         ch = xzalloc(sizeof(*ch));
         ch->ifname = xstrdup(ifname);