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

*: 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