LU-1889 build: fix false 'uninitialized scalar variable' errs

Fix false 'uninitialized scalar variable' errors found by Coverity
version 6.0.3:
Uninitialized scalar variable (UNINIT)
Using uninitialized value, element or field when calling function.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: I83a7dd3ae4a027bf0ebced572245bc4fff35e119
Reviewed-on: http://review.whamcloud.com/3939
Tested-by: Hudson
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>