drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()'

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SUSE CVE-2024-26672

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix variable 'mcafuncs' dereferenced before NULL check in 'amdgpumcasmugetmcaentry' Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpumca.c:377 amdgpumcasmugetmcaentry warn: variable dereferenced before check 'mcafunc...