rpcserver: request shutdown from signal package

rpcserver.go

@@ -26,6 +26,7 @@ import (
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing"
+	"github.com/lightningnetwork/lnd/signal"
 	"github.com/lightningnetwork/lnd/zpay32"
 	"github.com/roasbeef/btcd/blockchain"
 	"github.com/roasbeef/btcd/btcec"
@@ -3415,7 +3416,7 @@ func (r *rpcServer) GetNetworkInfo(ctx context.Context,
 func (r *rpcServer) StopDaemon(ctx context.Context,
 	_ *lnrpc.StopRequest) (*lnrpc.StopResponse, error) {
 
-	shutdownRequestChannel <- struct{}{}
+	signal.RequestShutdown()
 	return &lnrpc.StopResponse{}, nil
 }