LU-4047 build: fix 'memory' errors

LU-4047 build: fix 'memory' errors

Fix 'memory corruption' defects found by Coverity version 6.6.1:
Out-of-bounds write (OVERRUN)
Overrunning array at byte offset using index.
Fix 'memory illegal accesses' defects found by Coverity version 6.6.1:
Read from pointer after free (USE_AFTER_FREE)
Dereferencing freed pointer.
Readlink used insecurely (READLINK)
buffer[sizeof(buffer)] is an off-by-one error.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: I91af9fae93f89275cf6d3ad97bdc37958c0d709e
Reviewed-on: http://review.whamcloud.com/7822
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>