[PATCH] drm/tiny: sharp-memory: fix pointer error dereference

[Ethan Tidmore]

The function devm_drm_dev_alloc() returns a pointer error upon failure
not NULL. Change null check to pointer error check.

Detected by Smatch:
drivers/gpu/drm/tiny/sharp-memory.c:549 sharp_memory_probe() error:
'smd' dereferencing possible ERR_PTR()

Fixes: b8f9f21716fec ("drm/tiny: Add driver for Sharp Memory LCD")
Signed-off-by: Ethan Tidmore <ethantidmor...@gmail.com>
---
 drivers/gpu/drm/tiny/sharp-memory.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tiny/sharp-memory.c 
b/drivers/gpu/drm/tiny/sharp-memory.c
index 64272cd0f6e2..cbf69460ebf3 100644
--- a/drivers/gpu/drm/tiny/sharp-memory.c
+++ b/drivers/gpu/drm/tiny/sharp-memory.c
@@ -541,8 +541,8 @@ static int sharp_memory_probe(struct spi_device *spi)
 
        smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver,
                                 struct sharp_memory_device, drm);
-       if (!smd)
-               return -ENOMEM;
+       if (IS_ERR(smd))
+               return PTR_ERR(smd);
 
        spi_set_drvdata(spi, smd);
 
-- 
2.53.0