ASoC: (SOF) topology: Regression fixes for next

Merge series from Peter Ujfalusi <peter.ujfalusi@linux.intel.com>:

Today I came across two regressions in next with SOF:

The topology would not load with a failure of creating playback DAI
the first patch is fixing this which was caused by a missing 'else' in the patch

After fixing the topology loading, the module unloading caused kernel panic.
The second patch is correcting that which is I likely caused by copy-paste to
set wrong unload callback for the graph element.

With these patches applied SOF is working on next and modules can be unloaded