In seek_sanity_test getting return value is missing. Thus we couldn't
get the result unless someone read the log file (e.g. # 285).
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Reviewed-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Mark Tinguely <tinguely@sgi.com>