drm/amd/display: add NULL pointer check

[Why]
In virtual link use case, link->ddc could be NULL.

[How]
Add null pointer check to avoid undefined behavior.

Reviewed-by: Martin Leung <[email protected]>
Reviewed-by: Hansen Dsouza <[email protected]>
Acked-by: Qingqing Zhuo <[email protected]>
Signed-off-by: Charlene Liu <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

0 files changed, 0 insertions, 0 deletions