[PATCH -next] drm/vgem: Fix return value check in vgem_init()

[Wei Yongjun]

From: Wei Yongjun <weiyongj...@huawei.com>

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

Fixes: 315f0242aa2b ("drm/vgem: Convert to a struct drm_device subclass")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 drivers/gpu/drm/vgem/vgem_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index 54ec94c..18f401b 100644
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -438,8 +438,8 @@ static int __init vgem_init(void)
 
        vgem_device->platform =
                platform_device_register_simple("vgem", -1, NULL, 0);
-       if (!vgem_device->platform) {
-               ret = -ENODEV;
+       if (IS_ERR(vgem_device->platform)) {
+               ret = PTR_ERR(vgem_device->platform);
                goto out_fini;
        }