LU-2644 build: fix 'resource leak' errors

LU-2644 build: fix 'resource leak' errors

Fix 'resource leak' defects found by Coverity version 6.0.3:
Resource leak (RESOURCE_LEAK)
Variable going out of scope leaks the storage it points to.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: I9fae1905848a83393b7258449bfafd1fc0a342a7
Reviewed-on: http://review.whamcloud.com/5131
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Tested-by: Hudson
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>