openchannel: return error on hash creation failure

Return an error instead of just logging when chainhash.NewHash fails in
the ChanPending handler. The hash variable would be nil and crash on the
subsequent String() call.

staticaddr/openchannel/manager.go

@@ -693,8 +693,8 @@ func (m *Manager) openChannelPsbt(ctx context.Context,
 				update.ChanPending.Txid,
 			)
 			if err != nil {
-				log.Infof("Error creating hash for channel "+
-					"open tx: %v", err)
+				return nil, fmt.Errorf("error creating "+
+					"hash for channel open tx: %w", err)
 			}
 
 			chanOutpoint := &wire.OutPoint{