[gustavoars:testing/wfamnae-next20240710-cbc 12/13] ./usr/include/linux/ethtool.h:1644:15: error: unknown type name 'offsetof'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git testing/wfamnae-next20240710-cbc
head:   73efb8d9b6a2ba4b07021861a1760ec742ddf432
commit: d2fc97b383bbbdff9312f7993dbc9fd9d44bf379 [12/13] ethtool: Avoid -Wflex-array-member-not-at-end warning
config: i386-buildonly-randconfig-001-20240711 (https://download.01.org/0day-ci/archive/20240712/202407120212.LWwEpZgQ-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240712/202407120212.LWwEpZgQ-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202407120212.LWwEpZgQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
>> ./usr/include/linux/ethtool.h:1644:15: error: unknown type name 'offsetof'
    1644 | static_assert(offsetof(struct ethtool_dump, data) ==
         |               ^~~~~~~~
   ./usr/include/linux/ethtool.h:22:1: note: 'offsetof' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
      21 | #include <limits.h> /* for INT_MAX */
     +++ |+#include <stddef.h>
      22 | 
>> ./usr/include/linux/ethtool.h:1646:15: error: expected declaration specifiers or '...' before string constant
    1646 |               "struct member outside of __struct_group()");
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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