There is a warning message that can't be printed because we test the
wrong variable.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/mtd/nand/denali_dt.c b/drivers/mtd/nand/denali_dt.c
index 546f8cb..02988b0 100644
--- a/drivers/mtd/nand/denali_dt.c
+++ b/drivers/mtd/nand/denali_dt.c
@@ -42,7 +42,7 @@ static void __iomem *request_and_map(struct device *dev,
        }
 
        ptr = devm_ioremap_nocache(dev, res->start, resource_size(res));
-       if (!res)
+       if (!ptr)
                dev_err(dev, "ioremap_nocache of %s failed!", res->name);
 
        return ptr;
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