[PATCH] drm/simpledrm: Fix an NULL vs IS_ERR() bug

[Dan Carpenter]

The devm_memremap() function doesn't return NULL, it returns error
pointers.

Fixes: 9a10c7e6519b ("drm/simpledrm: Add support for system memory framebuffers")
Signed-off-by: Dan Carpenter <error27 at gmail.com>
---
 drivers/gpu/drm/tiny/simpledrm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
index 2acc0eb32489..63881a3754f8 100644
--- a/drivers/gpu/drm/tiny/simpledrm.c
+++ b/drivers/gpu/drm/tiny/simpledrm.c
@@ -719,8 +719,8 @@ static struct simpledrm_device *simpledrm_device_create(struct drm_driver *drv,
 		drm_dbg(dev, "using system memory framebuffer at %pr\n", mem);
 
 		screen_base = devm_memremap(dev->dev, mem->start, resource_size(mem), MEMREMAP_WC);
-		if (!screen_base)
-			return ERR_PTR(-ENOMEM);
+		if (IS_ERR(screen_base))
+			return screen_base;
 
 		iosys_map_set_vaddr(&sdev->screen_base, screen_base);
 	} else {
-- 
2.35.1