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[why & how] Make sure plane_state is not null before calling a function that dereferences it. Besides, remove redundant codes. Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Wayne Lin <Wayne.Lin@amd.com> Signed-off-by: Tom Chung <chiahsuan.chung@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>