NFSD: Use xdrgen XDR functions for the NFSv2 NULL procedure

Hand-written XDR encoders and decoders are difficult to maintain
and can diverge from protocol specifications. Migrating to
xdrgen-generated code improves type safety and ensures the
implementation matches the NFS version 2 protocol specification
exactly.

Convert the NULL procedure to use xdrgen_svc_decode_void and
xdrgen_svc_encode_void, the built-ins declared in
include/linux/sunrpc/xdrgen/_builtins.h. NULL has no arguments or
results, so it is the first procedure converted.

NULL returns no XDR-encoded data, so pc_xdrressize is set to
XDR_void. The argzero field is also set to zero since xdrgen
decoders initialize all decoded values.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260916162859.2051-9-cel@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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