drm/amd/display: Add NULL plane_state check for cursor disable logic

[Why]
While scanning the top_pipe connections we can run into a case where
the bottom pipe is still connected to a top_pipe but with a NULL
plane_state.

[How]
Treat a NULL plane_state the same as the plane being invisible for
pipe cursor disable logic.

Cc: [email protected]
Cc: Mario Limonciello <[email protected]>
Reviewed-by: Charlene Liu <[email protected]>
Acked-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Nicholas Kazlauskas <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

0 files changed, 0 insertions, 0 deletions