drm/amdgpu: Clean up errors in mxgpu_vi.c

Fix the following errors reported by checkpatch:

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

Signed-off-by: Ran Sun <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 1 insertions, 1 deletions

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);
 	}