SUNRPC: Add a helper rpc_call_start() that initialises task->tk_action

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index aefe3ae..7aeffee 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -634,6 +634,13 @@
 }
 EXPORT_SYMBOL_GPL(rpc_call_setup);
 
+void
+rpc_call_start(struct rpc_task *task)
+{
+	task->tk_action = call_start;
+}
+EXPORT_SYMBOL_GPL(rpc_call_start);
+
 /**
  * rpc_peeraddr - extract remote peer address from clnt's xprt
  * @clnt: RPC client structure