drm/amd/display: Avoid NULL dereference of timing generator
[Why & How] Check whether assigned timing generator is NULL or not before accessing its funcs to prevent NULL dereference. Reviewed-by: Jun Lei <jun.lei@amd.com> Acked-by: Hersen Wu <hersenxs.wu@amd.com> Signed-off-by: Wayne Lin <wayne.lin@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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