cxl: Fix build when CONFIG_DEBUG_FS=n
Stub out the debugfs functions so that the build doesn't break when CONFIG_DEBUG_FS=n. Reported-by: NMichael Ellerman <mpe@ellerman.id.au> Signed-off-by: NAndrew Donnellan <andrew.donnellan@au1.ibm.com> Acked-by: NIan Munsie <imunsie@au1.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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