[PATCH - PCM rate v2 1/1] pcm: rate: Add error check for snd_pcm_avail_update()

[<twischer@de.adit-jv.com>]

From: Timo Wischer <twischer@de.adit-jv.com>

Without these changes a negative error code returned by
snd_pcm_avail_update() will be not handled correctly.

With this patch the returned error code of snd_pcm_avail_update() will be
returned by snd_pcm_rate_avail_update().

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>
---
Compared to v1[1] of this patch only the changelog and the subject has changed.

[1] http://mailman.alsa-project.org/pipermail/alsa-devel/2018-July/137838.html

diff --git a/src/pcm/pcm_rate.c b/src/pcm/pcm_rate.c
index 4e0c7ca..031a43d 100644
--- a/src/pcm/pcm_rate.c
+++ b/src/pcm/pcm_rate.c
@@ -970,9 +970,12 @@ static snd_pcm_sframes_t snd_pcm_rate_avail_update(snd_pcm_t *pcm)
 {
 	snd_pcm_rate_t *rate = pcm->private_data;
 	snd_pcm_t *slave = rate->gen.slave;
-	snd_pcm_uframes_t slave_size;
+	snd_pcm_sframes_t slave_size;
 
 	slave_size = snd_pcm_avail_update(slave);
+	if (slave_size < 0)
+		return slave_size;
+
 	if (pcm->stream == SND_PCM_STREAM_CAPTURE)
 		goto _capture;
 	snd_pcm_rate_sync_hwptr(pcm);
-- 
2.7.4