cix: Fix ref_clk/ddr_data error checks#49

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USAVault wants to merge 3 commits into

cixtech:mainfrom

USAVault:usb3-fix-ref-clk

Commits on Jul 15, 2026

Fix validation check: apb_clk => ref_clk
USAVault
committed

Commits on Jul 16, 2026

Fix validation check: vaddr => ddr_data
USAVault
committed
Also kzalloc returns NULL on failure, not an ERR_PTR. Removed redundant IS_ERR_OR_NULL
USAVault
committed