[LAD] [PATCH] lash: robustify alsa-sequencer event reception

Hi,

trying lash-0.5.3 here, weired things happened:
I set up a simple project with only 1 lash_synth, the lash_synth
was connected to an alsa-sequencer keyboard port and to jack.
After saving, closing and restarting that lash-project,
the alsa-sequencer connection wasn't restored, until I launched an
innocent "aconnect -il" in an other terminal.
Funny, no?
Reason is I think, that after polling for alsa-seq events, always
only 1 event was red via snd_seq_event_input().

Attached patch cures & simplifies things by avoiding the poll() call
and using pthread_cancel() to stop the thread.

      Karsten

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