alsa: improve multiError handling in setup function

The error handling in the alsa package’s setup function is not correct. If an error is caused by an invalid config parameter ie. a multiError, it shouldn’t stop the rest of the function from executing, but it currently does. The errors should only be returned at the end of the function.

A related issue is that the method of checking if the error returned is a multiError is not correct. (audio_linux.go) This causes the function to treat the multiError as a normal error and stop the program.

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