Fix coverity defects of unused value. Coverity issue: 357745, 357769 Fixes: b8b4c54ef9b0 ("net/iavf: support flexible Rx descriptor in normal path") Signed-off-by: Leyi Rong <leyi.rong@intel.com> Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>