media: mc: Fix graph walk in media_pipeline_start

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DEBIAN-CVE-2024-39481

In the Linux kernel, the following vulnerability has been resolved: media: mc: Fix graph walk in mediapipelinestart The graph walk tries to follow all links, even if they are not between pads. This causes a crash with, e.g. a MEDIALNKFLANCILLARYLINK link. Fix this by allowing the walk to proceed...