LU-5383 utils: fix array index out of bounds

LU-5383 utils: fix array index out of bounds

Possible attempt to access element -8..-1 of array 'ldd_svname'.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: Ib4ec6a6d74ff6e805725d0ff4487868b7cbffa2f
Reviewed-on: http://review.whamcloud.com/12524
Tested-by: Jenkins
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>