LU-2929 build: fix unused/uninitilized virables error

LU-2929 build: fix unused/uninitilized virables error

As reported by gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2).

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: I05aeb88dbd00b6b005ddde543a527339a9d66ce0
Reviewed-on: http://review.whamcloud.com/5656
Reviewed-by: John Hammond <johnlockwoodhammond@gmail.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Alexey Shvetsov <alexxy@gentoo.org>