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pulseaudio: ignore zero-length writes [bug #277]

Pulseaudio (supposedly) doesn't like zero-length writes.  Return
early to avoid a bogus error.

--- a/src/pulseaudio.c

+++ b/src/pulseaudio.c

@@ -126,6 +126,9 @@

   size_t len;

   int rc, error;

+  if (!nsamp)

+    return 0;

+

   /* Pulse Audio buffer lengths are true buffer lengths and not

    * count of samples. */

   len = nsamp * sizeof(sox_sample_t);