drm/amd/display: clean up some inconsistent indenting

Eliminate the follow smatch warning:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9687
amdgpu_dm_atomic_commit_tail() warn: inconsistent indenting.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -9677,9 +9677,10 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 		dm_enable_per_frame_crtc_master_sync(dc_state);
 		mutex_lock(&dm->dc_lock);
 		WARN_ON(!dc_commit_state(dm->dc, dc_state));
-               /* Allow idle optimization when vblank count is 0 for display off */
-               if (dm->active_vblank_irq_count == 0)
-                   dc_allow_idle_optimizations(dm->dc,true);
+
+		/* Allow idle optimization when vblank count is 0 for display off */
+		if (dm->active_vblank_irq_count == 0)
+			dc_allow_idle_optimizations(dm->dc, true);
 		mutex_unlock(&dm->dc_lock);
 	}