[PATCH] drm/amdgpu: Clean up errors in mxgpu_vi.c

[Ran Sun]

Fix the following errors reported by checkpatch:

ERROR: spaces required around that '-=' (ctx:WxV)

Signed-off-by: Ran Sun <sunran001 at 208suo.com>
---
 drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c
index 288c414babdf..59f53c743362 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_vi.c
@@ -334,7 +334,7 @@ static void xgpu_vi_mailbox_send_ack(struct amdgpu_device *adev)
 			break;
 		}
 		mdelay(1);
-		timeout -=1;
+		timeout -= 1;
 
 		reg = RREG32_NO_KIQ(mmMAILBOX_CONTROL);
 	}
-- 
2.17.1