drm/amd/display: Pass non-null to dcn20_validate_apply_pipe_split_flags

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DEBIAN-CVE-2024-49923

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Pass non-null to dcn20validateapplypipesplitflags WHAT & HOW "dcn20validateapplypipesplitflags" dereferences merge, and thus it cannot be a null pointer. Let's pass a valid pointer to avoid null dereference. This...