Merge topic 'minor-fixes'

ce55a255 testSystemTools: fix some copy'n'paste issues
73c491e8 processUNIX: fix not null terminated buffer during error reporting
13e02b76 processUNIX: close intermediate file descriptor in error case
862562ce SystemInformation: fix potential off-by-one write

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !54