svcrdma: xpt_bc_xprt is already clear in __svc_rdma_free()

svc_xprt_free() already "puts" the bc_xprt before calling the
transport's "free" method. No need to do it twice.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -545,7 +545,6 @@ static void __svc_rdma_free(struct work_struct *work)
 {
 	struct svcxprt_rdma *rdma =
 		container_of(work, struct svcxprt_rdma, sc_work);
-	struct svc_xprt *xprt = &rdma->sc_xprt;
 
 	/* This blocks until the Completion Queues are empty */
 	if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
@@ -553,12 +552,6 @@ static void __svc_rdma_free(struct work_struct *work)
 
 	svc_rdma_flush_recv_queues(rdma);
 
-	/* Final put of backchannel client transport */
-	if (xprt->xpt_bc_xprt) {
-		xprt_put(xprt->xpt_bc_xprt);
-		xprt->xpt_bc_xprt = NULL;
-	}
-
 	svc_rdma_destroy_rw_ctxts(rdma);
 	svc_rdma_send_ctxts_destroy(rdma);
 	svc_rdma_recv_ctxts_destroy(rdma);