Fix Coverity warning with uninitialised field in structure being used. Zero out all the other unused ones. >>> CID 120413 (#1 of 1): Uninitialized scalar variable (UNINIT) Fixes: bda68ab9d1e7 ("examples/ethtool: add user-space ethtool sample application") Signed-off-by: Remy Horton <remy.horton@intel.com> Acked-by: John McNamara <john.mcnamara@intel.com>