[PATCH] tlg2300: fix missing check for audio creation

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

From: Alan Cox <alan@linux.intel.com>

If we fail to set up the capture device we go through negative indexes and
badness happens. Add the missing test.

Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=44551
Signed-off-by: Alan Cox <alan@linux.intel.com>
---

 drivers/media/usb/tlg2300/pd-alsa.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/usb/tlg2300/pd-alsa.c b/drivers/media/usb/tlg2300/pd-alsa.c
index 9f8b7da..0c77869 100644
--- a/drivers/media/usb/tlg2300/pd-alsa.c
+++ b/drivers/media/usb/tlg2300/pd-alsa.c
@@ -305,6 +305,10 @@ int poseidon_audio_init(struct poseidon *p)
 		return ret;
 
 	ret = snd_pcm_new(card, "poseidon audio", 0, 0, 1, &pcm);
+	if (ret < 0) {
+		snd_free_card(card);
+		return ret;
+	}
 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 	pcm->info_flags   = 0;
 	pcm->private_data = p;