[PATCH] (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 | 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