LU-1855 build: fix 'out-of-bounds access' errors

LU-1855 build: fix 'out-of-bounds access' errors

Fix 'out-of-bounds access' defects found by Coverity version 6.0.3:
Out-of-bounds access (OVERRUN_STATIC)
Overrunning static array by passing it to a
function which indexes it at a higher byte position.

Signed-off-by: Sebastien Buisson <sebastien.buisson@bull.net>
Change-Id: Ic0fd90787ef969c786e9b0149df83491cdddc631
Reviewed-on: http://review.whamcloud.com/3902
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>