xprtrdma: Simplify synopsis of rpcrdma_buffer_create()

Clean up: There is one call site for rpcrdma_buffer_create(). All of
the arguments there are fields of an rpcrdma_xprt.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
index 2b4e778..5c2fac3 100644
--- a/net/sunrpc/xprtrdma/xprt_rdma.h
+++ b/net/sunrpc/xprtrdma/xprt_rdma.h
@@ -354,9 +354,7 @@
 /*
  * Buffer calls - xprtrdma/verbs.c
  */
-int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *,
-				struct rpcrdma_ia *,
-				struct rpcrdma_create_data_internal *);
+int rpcrdma_buffer_create(struct rpcrdma_xprt *);
 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
 
 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);