compress_hw_get_hpointer: use SNDRV_COMPRESS_AVAIL64

Refactor compress_hw_get_hpointer to use the new SNDRV_COMPRESS_AVAIL64
which benefits from overflow safety.

Author: jorisverhaegen

src/lib/compress_hw.c

@@ -228,14 +228,14 @@ static int compress_hw_get_hpointer(void *data,
 		unsigned int *avail, struct timespec *tstamp)
 {
 	struct compress_hw_data *compress = (struct compress_hw_data *)data;
-	struct snd_compr_avail kavail;
+	struct snd_compr_avail64 kavail;
 	__u64 time;
 
 	if (!is_compress_hw_ready(compress))
 		return oops(compress, ENODEV, "device not ready");
 
-	if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &kavail))
-		return oops(compress, errno, "cannot get avail");
+	if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL64, &kavail))
+		return oops(compress, errno, "cannot get avail64");
 	if (0 == kavail.tstamp.sampling_rate)
 		return oops(compress, ENODATA, "sample rate unknown");
 	*avail = (unsigned int)kavail.avail;