net: Mellanox: Delete unnecessary checks before the function call "vunmap"

The vunmap() function performs also input parameter validation.
Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Acked-by: NEli Cohen <eli@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/alloc.c

@@ -662,7 +662,7 @@ void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf)
 				  buf->direct.buf,
 				  buf->direct.map);
 	else {
-		if (BITS_PER_LONG == 64 && buf->direct.buf)
+		if (BITS_PER_LONG == 64)
 			vunmap(buf->direct.buf);
 
 		for (i = 0; i < buf->nbufs; ++i)

drivers/net/ethernet/mellanox/mlx5/core/alloc.c

@@ -121,7 +121,7 @@ void mlx5_buf_free(struct mlx5_core_dev *dev, struct mlx5_buf *buf)
 		dma_free_coherent(&dev->pdev->dev, buf->size, buf->direct.buf,
 				  buf->direct.map);
 	else {
-		if (BITS_PER_LONG == 64 && buf->direct.buf)
+		if (BITS_PER_LONG == 64)
 			vunmap(buf->direct.buf);
 
 		for (i = 0; i < buf->nbufs; i++)