Comment 2 for bug 940415

StacktraceTop:
 memblock_free (b=<optimized out>) at pulsecore/memblock.c:558
 pa_memblock_unref (b=0x7f9b4c75f000) at pulsecore/memblock.c:595
 pa_sink_input_peek (i=0x26556b0, slength=30848, chunk=0x7f9b56bb3690, volume=0x7f9b56bb36a8) at pulsecore/sink-input.c:897
 fill_mix_info (s=0x2596bf0, length=0x7f9b56bb5d38, info=0x7f9b56bb3690, maxinfo=32) at pulsecore/sink.c:917
 pa_sink_render_into (s=0x2596bf0, target=0x7f9b56bb5d90) at pulsecore/sink.c:1156