media: cx23885: Add missing unmap in snd_cx23885_hw_params()

[ Upstream commit 141c818 ]

In error path, add cx23885_alsa_dma_unmap() to release the
resource acquired by cx23885_alsa_dma_map().

Fixes: 9529a4b ("[media] cx23885: drop videobuf abuse in cx23885-alsa")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Haoxiang Li

drivers/media/pci/cx23885/cx23885-alsa.c

@@ -392,8 +392,10 @@ static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 
 	ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
 				   chip->period_size, chip->num_periods, 1);
-	if (ret < 0)
+	if (ret < 0) {
+		cx23885_alsa_dma_unmap(chip);
 		goto error;
+	}
 
 	/* Loop back to start of program */
 	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);