[PATCH] (powerpc/512) Fix possible `dma_unmap_single()` on uninitialized pointer

If the device configuration fails (if `dma_dev->device_config()`),
`sg_dma_address(&sg)` is not initialized and the jump to `err_dma_prep`
leads to calling `dma_unmap_single()` on `sg_dma_address(&sg)`.

Signed-off-by: Thomas Fourier <redacted>
---
 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
index 9668b052cd4b..ef3be438f914 100644
--- a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
+++ b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c

@@ -241,8 +241,7 @@ static int mpc512x_lpbfifo_kick(void)
 
 	/* Make DMA channel work with LPB FIFO data register */
 	if (dma_dev->device_config(lpbfifo.chan, &dma_conf)) {
-		ret = -EINVAL;
-		goto err_dma_prep;
+		return -EINVAL;
 	}
 
 	sg_init_table(&sg, 1);

-- 
2.43.0