net/sfc: add missing header guard to TSO header file
net/sfc: add missing header guard to TSO header file

Add missing header guard, including compiler directive for cplusplus.

Fixes: f1f575be9b76 ("net/sfc: put generalised TSO declarations in a header")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <436a2feb05eb79a6862681e66bd0193220e8fb2d@oktetlabs.ru>
Signed-off-by: Andrew Rybchenko <ac94ab2a8fe9a9a087f6e24dcbc16626b52c07e8@solarflare.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk