The default case in the direction switch returns NULL without freeing
the descriptor allocated earlier via kzalloc_flex(). Add the missing
kfree(desc) before returning.

Fixes: 808347f6a317 ("dmaengine: at_hdmac: add DMA slave transfers")
Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/dma/at_hdmac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index f9c336630fa2..c06f70dbc4c5 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -1381,6 +1381,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 		}
 		break;
 	default:
+		kfree(desc);
 		return NULL;
 	}
 
-- 
2.55.0