[PATCH v2] (powerpc/512) Fix possible `dma_unmap_single()` on uninitialized pointer

[Thomas Fourier]

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 <fourier.tho...@gmail.com>
---
 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c 
b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
index 9668b052cd4b..f251e0f68262 100644
--- a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
+++ b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
@@ -240,10 +240,8 @@ static int mpc512x_lpbfifo_kick(void)
        dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 
        /* Make DMA channel work with LPB FIFO data register */
-       if (dma_dev->device_config(lpbfifo.chan, &dma_conf)) {
-               ret = -EINVAL;
-               goto err_dma_prep;
-       }
+       if (dma_dev->device_config(lpbfifo.chan, &dma_conf))
+               return -EINVAL;
 
        sg_init_table(&sg, 1);
 
-- 
2.43.0