[PATCH -next] drm/amdkfd: Fix resource_size.cocci warning

[Yang Li]

Use resource_size function on resource object instead of explicit
computation.

Eliminate the following coccicheck warning:
./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c:978:11-14: ERROR: Missing
resource_size with res

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Yang Li <yang....@linux.alibaba.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
index 8430f6475723..d4287a39be56 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -975,7 +975,7 @@ int svm_migrate_init(struct amdgpu_device *adev)
                pgmap->type = 0;
                if (pgmap->type == MEMORY_DEVICE_PRIVATE)
                        devm_release_mem_region(adev->dev, res->start,
-                                               res->end - res->start + 1);
+                                               resource_size(res));
                return PTR_ERR(r);
        }
 
-- 
2.20.1.7.g153144c