LU-3086 build: fix 'uninitialized variables' errors

Fix 'uninitialized variables' defects found by Coverity version 6.5.1:
Uninitialized scalar variable (UNINIT)
Using uninitialized value.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: I8df7c60823e392b37880ca5ddb1ea107554784e6
Reviewed-on: http://review.whamcloud.com/5916
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: John Hammond <johnlockwoodhammond@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>