ALSA: firewire-tascam: Fix to handle error from initialization of stream data

This module has a bug not to return error code in a case that data
structure for transmitted packets fails to be initialized.

This commit fixes the bug.

Fixes: 35efa5c4 ("ALSA: firewire-tascam: add streaming functionality")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/tascam/tascam-stream.c

@@ -343,7 +343,7 @@ int snd_tscm_stream_init_duplex(struct snd_tscm *tscm)
 	if (err < 0)
 		amdtp_stream_destroy(&tscm->rx_stream);
 
-	return 0;
+	return err;
 }
 
 /* At bus reset, streaming is stopped and some registers are clear. */