RPC: Fix return value of rpc_call_async()

 RPC call async is supposed to return an error if and only if
 it failed to run the rpc_task.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

net/sunrpc/clnt.c

@@ -406,12 +406,11 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
 	rpc_call_setup(task, msg, 0);
 
 	/* Set up the call info struct and execute the task */
-	if (task->tk_status == 0)
-		status = rpc_execute(task);
-	else {
-		status = task->tk_status;
+	status = task->tk_status;
+	if (status == 0)
+		rpc_execute(task);
+	else
 		rpc_release_task(task);
-	}
 
 out:
 	rpc_clnt_sigunmask(clnt, &oldset);