drm/amd/display: Add pointer check before function call
Call to immediate_disable_crtc was not checked before calling, exposing a potential null pointer hang. Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Reviewed-by: Charlene Liu <charlene.liu@amd.com> Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com> Signed-off-by: Sung Joon Kim <sungkim@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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