Check if PM Capability does not exists and return early which follows
the usual error handling pattern.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20231124084725.12738-6-ilpo.jarvinen@linux.intel.com