QMLManager::tryRetrieveDataFromBackend() was a one-liner calling
void QMLManager::checkCredentialsAndExecute() with a pointer-to-member.
The latter was never called with a different pointer, therefore
fold the latter into the former and remove the indirection.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
a07b6b4d97