NFSD: Budget the CB_RECALL_ANY opcode

NFS4_enc_cb_recall_any_sz counts the objects-to-keep field, the
bitmap array length, and the bitmap word. encode_cb_recallany4args()
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-v1-6-323aa7196055@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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