NFSD: Budget the CB_OFFLOAD opcode

NFS4_enc_cb_offload_sz counts the file handle, the stateid, and the
offload information. encode_cb_offload4args() emits an opcode ahead
of all three, so the macro falls one XDR word short.

This macro sizes p_arglen and nothing else. rq_callsize pads that
with two credential slacks, so the shortfall has never reached
the send buffer. No backport is needed.

Link: https://patch.msgid.link/20260802-nfsd-deleg-destroy-badhandle-v1-4-323aa7196055@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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