[PATCH] gpu: drm: i915: fix error return code of igt_buddy_alloc_smoke()

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When i915_random_order() returns NULL to order, no error return code of
igt_buddy_alloc_smoke() is assigned.
To fix this bug, err is assigned with -EINVAL in this case.

Fixes: 1fe3818d17c9 ("drm/i915/selftests: try to rein in alloc_smoke")
Reported-by: TOTE Robot <oslab@xxxxxxxxxxxxxxx>
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
---
 drivers/gpu/drm/i915/selftests/i915_buddy.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/i915_buddy.c b/drivers/gpu/drm/i915/selftests/i915_buddy.c
index 632b912b0bc9..cf9b551b77e1 100644
--- a/drivers/gpu/drm/i915/selftests/i915_buddy.c
+++ b/drivers/gpu/drm/i915/selftests/i915_buddy.c
@@ -318,8 +318,10 @@ static int igt_buddy_alloc_smoke(void *arg)
 	}
 
 	order = i915_random_order(mm.max_order + 1, &prng);
-	if (!order)
+	if (!order) {
+		err = -EINVAL;
 		goto out_fini;
+	}
 
 	for (i = 0; i <= mm.max_order; ++i) {
 		struct i915_buddy_block *block;
-- 
2.17.1

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