[PATCH net] nui: Fix dma_mapping_error() check

[Thomas Fourier]

dma_map_XXX() functions return as error values DMA_MAPPING_ERROR which
is often ~0. The error value should be tested with dma_mapping_error().

Fixes: ec2deec1f352 ("niu: Fix to check for dma mapping errors.")
Signed-off-by: Thomas Fourier <fourier.thomas@xxxxxxxxx>
---
 drivers/net/ethernet/sun/niu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sun/niu.c b/drivers/net/ethernet/sun/niu.c
index ddca8fc7883e..11ff08373de4 100644
--- a/drivers/net/ethernet/sun/niu.c
+++ b/drivers/net/ethernet/sun/niu.c
@@ -3336,7 +3336,7 @@ static int niu_rbr_add_page(struct niu *np, struct rx_ring_info *rp,
 
 	addr = np->ops->map_page(np->device, page, 0,
 				 PAGE_SIZE, DMA_FROM_DEVICE);
-	if (!addr) {
+	if (dma_mapping_error(np->device, addr)) {
 		__free_page(page);
 		return -ENOMEM;
 	}
-- 
2.43.0