fix: always report when alsa driver output loop exists

The player manage loop requires for the driver to notify anytime the output loops stops, whether it is by an error or not (e.g. EOF).

output/driver_unix.go

@@ -182,11 +182,8 @@ func (out *output) setupPcm() error {
 	// (Pause() or Close()) or there is an error.
 	pcmHandle := out.pcmHandle
 	go func() {
-		err := out.outputLoop(pcmHandle)
-		if err != nil {
-			out.err <- err
-			_ = out.Close()
-		}
+		out.err <- out.outputLoop(pcmHandle)
+		_ = out.Close()
 	}()
 
 	return nil