cnct: do not log resolver shutting down as error

contractcourt/commit_sweep_resolver.go

@@ -2,7 +2,6 @@ package contractcourt
 
 import (
 	"encoding/binary"
-	"fmt"
 	"io"
 
 	"github.com/btcsuite/btcd/wire"
@@ -78,11 +77,11 @@ func (c *commitSweepResolver) Resolve() (ContractResolver, error) {
 	select {
 	case _, ok := <-confNtfn.Confirmed:
 		if !ok {
-			return nil, fmt.Errorf("quitting")
+			return nil, errResolverShuttingDown
 		}
 
 	case <-c.Quit:
-		return nil, fmt.Errorf("quitting")
+		return nil, errResolverShuttingDown
 	}
 
 	// We're dealing with our commitment transaction if the delay on the
@@ -129,7 +128,7 @@ func (c *commitSweepResolver) Resolve() (ContractResolver, error) {
 			log.Infof("ChannelPoint(%v) commit tx is fully resolved by "+
 				"sweep tx: %v", c.chanPoint, sweepResult.Tx.TxHash())
 		case <-c.Quit:
-			return nil, fmt.Errorf("quitting")
+			return nil, errResolverShuttingDown
 		}
 
 		c.resolved = true
@@ -155,7 +154,7 @@ func (c *commitSweepResolver) Resolve() (ContractResolver, error) {
 	select {
 	case commitSpend, ok := <-spendNtfn.Spend:
 		if !ok {
-			return nil, fmt.Errorf("quitting")
+			return nil, errResolverShuttingDown
 		}
 
 		// Once we detect the commitment output has been spent,
@@ -171,7 +170,7 @@ func (c *commitSweepResolver) Resolve() (ContractResolver, error) {
 			return nil, err
 		}
 	case <-c.Quit:
-		return nil, fmt.Errorf("quitting")
+		return nil, errResolverShuttingDown
 	}
 
 	log.Infof("%T(%v): waiting for commit sweep txid=%v conf", c, c.chanPoint,
@@ -190,14 +189,14 @@ func (c *commitSweepResolver) Resolve() (ContractResolver, error) {
 	select {
 	case confInfo, ok := <-confNtfn.Confirmed:
 		if !ok {
-			return nil, fmt.Errorf("quitting")
+			return nil, errResolverShuttingDown
 		}
 
 		log.Infof("ChannelPoint(%v) commit tx is fully resolved, at height: %v",
 			c.chanPoint, confInfo.BlockHeight)
 
 	case <-c.Quit:
-		return nil, fmt.Errorf("quitting")
+		return nil, errResolverShuttingDown
 	}
 
 	// Once the transaction has received a sufficient number of