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PM / core: Introduce dpm_async_fn() helper
When we want to execute device pm functions asynchronously, we'll
do the following for the device:
1) reinit_completion(&dev->power.completion);
2) Check if the device enables asynchronous suspend.
3) If necessary, execute the corresponding function asynchronously.
There are a lot of such repeated operations here, in fact we can avoid
this. So introduce dpm_async_fn() to have better code readability and
reuse.
And use this function to do some cleanup.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>