spi: davinci: fix up dma_mapping_error() incorrect patch

commit 11dd9e2c, which is commit
c5a2a394 upstream had an error in it.

Ben writes:
    The '!' needs to be deleted.  This appears to have been fixed upstream
    by:

    commit 8aedbf58
    Author: Fabien Parent <fparent@baylibre.com>
    Date:   Thu Feb 23 19:01:56 2017 +0100

	spi: davinci: Use SPI framework to handle DMA mapping

    which is not suitable for stable.

So I'm just fixing this up directly.
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/spi/spi-davinci.c

@@ -651,7 +651,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
 			buf = t->rx_buf;
 		t->rx_dma = dma_map_single(&spi->dev, buf,
 				t->len, DMA_FROM_DEVICE);
-		if (dma_mapping_error(&spi->dev, !t->rx_dma)) {
+		if (dma_mapping_error(&spi->dev, t->rx_dma)) {
 			ret = -EFAULT;
 			goto err_rx_map;
 		}