deps: bump tm-db to 0.6.0 (#5058)

abci/example/kvstore/kvstore.go

@@ -49,7 +49,10 @@ func saveState(state State) {
 	if err != nil {
 		panic(err)
 	}
-	state.db.Set(stateKey, stateBytes)
+	err = state.db.Set(stateKey, stateBytes)
+	if err != nil {
+		panic(err)
+	}
 }
 
 func prefixKey(key []byte) []byte {
@@ -92,7 +95,10 @@ func (app *Application) DeliverTx(req types.RequestDeliverTx) types.ResponseDeli
 		key, value = req.Tx, req.Tx
 	}
 
-	app.state.db.Set(prefixKey(key), value)
+	err := app.state.db.Set(prefixKey(key), value)
+	if err != nil {
+		panic(err)
+	}
 	app.state.Size++
 
 	events := []types.Event{

abci/example/kvstore/persistent_kvstore.go

@@ -189,6 +189,9 @@ func (app *PersistentKVStoreApplication) Validators() (validators []types.Valida
 			validators = append(validators, *validator)
 		}
 	}
+	if err = itr.Error(); err != nil {
+		panic(err)
+	}
 	return
 }
 
@@ -259,7 +262,9 @@ func (app *PersistentKVStoreApplication) updateValidator(v types.ValidatorUpdate
 				Code: code.CodeTypeUnauthorized,
 				Log:  fmt.Sprintf("Cannot remove non-existent validator %s", pubStr)}
 		}
-		app.app.state.db.Delete(key)
+		if err = app.app.state.db.Delete(key); err != nil {
+			panic(err)
+		}
 		delete(app.valAddrToPubKeyMap, string(pubkey.Address()))
 	} else {
 		// add or update validator
@@ -269,7 +274,9 @@ func (app *PersistentKVStoreApplication) updateValidator(v types.ValidatorUpdate
 				Code: code.CodeTypeEncodingError,
 				Log:  fmt.Sprintf("Error encoding validator: %v", err)}
 		}
-		app.app.state.db.Set(key, value.Bytes())
+		if err = app.app.state.db.Set(key, value.Bytes()); err != nil {
+			panic(err)
+		}
 		app.valAddrToPubKeyMap[string(pubkey.Address())] = v.PubKey
 	}