Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6f111a4c24ecd42c874d349081efbbd8376ab715
  - Added null check for latestStack to prevent crash
    at method calls; moved latestStack declaration
    according to comment by maintainer
    
    Issue-ID: SO-1841
    Signed-off-by: Oleksandr Moliavko <o.moliavko@samsung.com>
    Change-Id: Ic4bfeca94103f6c902808de39df752569580c066
    
1 file changed