Revert "ao_coreaudio: switch to ao_read_data_nonblocking()"

This reverts commit 36d5b52612.

audio/out/ao_coreaudio.c

@@ -89,7 +89,7 @@ static OSStatus render_cb_lpcm(void *ctx, AudioUnitRenderActionFlags *aflags,
 
     int64_t end = mp_time_ns();
     end += p->hw_latency_ns + ca_get_latency(ts) + ca_frames_to_ns(ao, frames);
-    int samples = ao_read_data_nonblocking(ao, planes, frames, end);
+    int samples = ao_read_data(ao, planes, frames, end);
 
     if (samples == 0)
         *aflags |= kAudioUnitRenderAction_OutputIsSilence;