svcrdma: Remove unused svc_rdma_op_ctxt

extern atomic_t rdma_stat_sq_poll;

extern atomic_t rdma_stat_sq_prod;

/*

 * Contexts are built when an RDMA request is created and are a

 * record of the resources that can be recovered when the request

 * completes.

 */

struct svc_rdma_op_ctxt {

	struct list_head list;

	struct xdr_buf arg;

	struct ib_cqe cqe;

	u32 byte_len;

	struct svcxprt_rdma *xprt;

	enum dma_data_direction direction;

	int count;

	unsigned int mapped_sges;

	int hdr_count;

	struct ib_send_wr send_wr;

	struct ib_sge sge[1 + RPCRDMA_MAX_INLINE_THRESH / PAGE_SIZE];

	struct page *pages[RPCSVC_MAXPAGES];

};

struct svcxprt_rdma {

	struct svc_xprt      sc_xprt;		/* SVC transport structure */

	struct rdma_cm_id    *sc_cm_id;		/* RDMA connection id */

	spinlock_t	     sc_send_lock;

	struct list_head     sc_send_ctxts;

	int		     sc_ctxt_used;

	spinlock_t	     sc_rw_ctxt_lock;

	struct list_head     sc_rw_ctxts;