audio: module: Fix passthrough module

After commit 5f6f22d ("audio: module_adapter: Prepare to convert
copier to use module interface") period_bytes are no longer computed in
module generic prepare.

This break the passthrough module as it was using period_bytes computed
by upper layers.

Fix this by computing period_bytes inside passthrough module prepare
function.

Fixes: 5f6f22d ("audio: module_adapter: Prepare to convert
copier to use module interface")
Signed-off-by: Daniel Baluta <[email protected]>

src/audio/module_adapter/module/passthrough.c

@@ -26,9 +26,12 @@ static int passthrough_codec_prepare(struct processing_module *mod,
 {
 	struct comp_dev *dev = mod->dev;
 	struct module_data *codec = &mod->priv;
+	struct comp_buffer *source = comp_dev_get_first_data_producer(dev);
 
 	comp_info(dev, "passthrough_codec_prepare()");
 
+	mod->period_bytes =  audio_stream_period_bytes(&source->stream, dev->frames);
+
 	codec->mpd.in_buff = rballoc(0, SOF_MEM_CAPS_RAM, mod->period_bytes);
 	if (!codec->mpd.in_buff) {
 		comp_err(dev, "passthrough_codec_prepare(): Failed to alloc in_buff");