oc_uuid_to_str terminates the string with nul ('\0')

Signed-off-by: George Nash <george.nash@intel.com>
Status Job ID Name Coverage
  Build
passed #1427
Android_build

00:03:52

passed #1425
Linux_Secured_Test

00:01:01

passed #1426
Linux_Unsecured_Test

00:00:45

passed #1428
whitespace_and_doxygen

00:00:24