PulseAudio: increase buffer size to max VLC can do

This suppresses most hiccups. But it also decreases precision to
slightly noticeable levels: about +/-150ms here. For reference, our
audio output core target is +/-40ms.

modules/audio_output/pulse.c

@@ -347,8 +347,8 @@ static int Open(vlc_object_t *obj)
     const uint32_t byterate = pa_bytes_per_second(&ss);
     struct pa_buffer_attr attr;
     /* no point in larger buffers on PA side than VLC */
-    attr.maxlength = byterate * AOUT_MAX_ADVANCE_TIME / CLOCK_FREQ;
-    attr.tlength = byterate * AOUT_MAX_PREPARE_TIME / CLOCK_FREQ;
+    attr.maxlength = -1;
+    attr.tlength = byterate * AOUT_MAX_ADVANCE_TIME / CLOCK_FREQ;
     attr.prebuf = byterate * AOUT_MIN_PREPARE_TIME / CLOCK_FREQ;
     attr.minreq = -1;
     attr.fragsize = 0; /* not used for output */