[PATCH -next] mtd: nand: omap2: fix return value check in omap_nand_probe()

[weiyj_lk]

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

In case of error, the function dma_request_chan() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Fixes: aa7abd312c11 ('mtd: nand: omap2: Support parsing dma channel
information from DT')
Signed-off-by: Wei Yongjun <yongjun_...@trendmicro.com.cn>
---
 drivers/mtd/nand/omap2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index a36ad3d..26fbe29 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1922,9 +1922,9 @@ static int omap_nand_probe(struct platform_device *pdev)
                dma_cap_set(DMA_SLAVE, mask);
                info->dma = dma_request_chan(pdev->dev.parent, "rxtx");
 
-               if (!info->dma) {
+               if (IS_ERR(info->dma)) {
                        dev_err(&pdev->dev, "DMA engine request failed\n");
-                       err = -ENXIO;
+                       err = PTR_ERR(info->dma);
                        goto return_error;
                } else {
                        struct dma_slave_config cfg;