D12744: Add null pointer check when creating SocketAddress

[Chinmoy Ranjan Pradhan]

chinmoyr added a dependency: D10411: Create socket file in user's runtime 
directory.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D12744

To: chinmoyr, dfaure, ossi
Cc: #frameworks, michaelh, ngraham, bruns