multi: fix issues reported by whitespace linter

contractcourt/htlc_success_resolver_test.go

@@ -62,6 +62,7 @@ func newHtlcResolverTestContext(t *testing.T,
 			Sweeper: newMockSweeper(),
 			IncubateOutputs: func(wire.OutPoint, *lnwallet.OutgoingHtlcResolution,
 				*lnwallet.IncomingHtlcResolution, uint32) error {
+
 				return nil
 			},
 			DeliverResolutionMsg: func(msgs ...ResolutionMsg) error {
@@ -86,6 +87,7 @@ func newHtlcResolverTestContext(t *testing.T,
 	// this so set nolint directive.
 	checkpointFunc := func(c ContractResolver, // nolint
 		r ...*channeldb.ResolverReport) error {
+
 		return testCtx.checkpoint(c, r...)
 	}
 
@@ -253,6 +255,7 @@ func TestHtlcSuccessSecondStageResolution(t *testing.T) {
 			// to resolve our htlc.
 			preCheckpoint: func(ctx *htlcResolverTestContext,
 				_ bool) error {
+
 				ctx.notifier.SpendChan <- &chainntnfs.SpendDetail{
 					SpendingTx:    sweepTx,
 					SpenderTxHash: &sweepHash,