Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 64873296c944c32481348c337f8adab7dc0b5637
  - Merge "Refactor unused line and refactor nested if"
  - Refactor unused line and refactor nested if
    
    Issue-ID: SO-1841
    Signed-off-by: Tomasz Wrobel <tomasz.wrobel@nokia.com>
    Change-Id: Ie4f1eb6bf1c053771ac9f302468b13ac3a3d93dd
    
1 file changed