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There is no need to return always zero for function which is not supported, especially since 0 is the wrong return code. Link: https://lore.kernel.org/r/20211102073054.410838-1-kamalheib1@gmail.com Signed-off-by: Kamal Heib <kamalheib1@gmail.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>