all: more linters (#24783)

This enables the following linters

- typecheck
- unused
- staticcheck
- bidichk
- durationcheck
- exportloopref
- gosec

WIth a few exceptions.

- We use a deprecated protobuf in trezor. I didn't want to mess with that, since I cannot meaningfully test any changes there.
- The deprecated TypeMux is used in a few places still, so the warning for it is silenced for now.
- Using string type in context.WithValue is apparently wrong, one should use a custom type, to prevent collisions between different places in the hierarchy of callers. That should be fixed at some point, but may require some attention.
- The warnings for using weak random generator are squashed, since we use a lot of random without need for cryptographic guarantees.

cmd/geth/accountcmd.go

@@ -239,14 +239,15 @@ func ambiguousAddrRecovery(ks *keystore.KeyStore, err *keystore.AmbiguousAddrErr
 	}
 	fmt.Println("Testing your password against all of them...")
 	var match *accounts.Account
-	for _, a := range err.Matches {
-		if err := ks.Unlock(a, auth); err == nil {
-			match = &a
+	for i, a := range err.Matches {
+		if e := ks.Unlock(a, auth); e == nil {
+			match = &err.Matches[i]
 			break
 		}
 	}
 	if match == nil {
 		utils.Fatalf("None of the listed files could be unlocked.")
+		return accounts.Account{}
 	}
 	fmt.Printf("Your password unlocked %s\n", match.URL)
 	fmt.Println("In order to avoid this warning, you need to remove the following duplicate key files:")

cmd/geth/les_test.go

@@ -81,41 +81,6 @@ func (g *gethrpc) getNodeInfo() *p2p.NodeInfo {
 	return g.nodeInfo
 }
 
-func (g *gethrpc) waitSynced() {
-	// Check if it's synced now
-	var result interface{}
-	g.callRPC(&result, "eth_syncing")
-	syncing, ok := result.(bool)
-	if ok && !syncing {
-		g.geth.Logf("%v already synced", g.name)
-		return
-	}
-
-	// Actually wait, subscribe to the event
-	ch := make(chan interface{})
-	sub, err := g.rpc.Subscribe(context.Background(), "eth", ch, "syncing")
-	if err != nil {
-		g.geth.Fatalf("%v syncing: %v", g.name, err)
-	}
-	defer sub.Unsubscribe()
-	timeout := time.After(4 * time.Second)
-	select {
-	case ev := <-ch:
-		g.geth.Log("'syncing' event", ev)
-		syncing, ok := ev.(bool)
-		if ok && !syncing {
-			break
-		}
-		g.geth.Log("Other 'syncing' event", ev)
-	case err := <-sub.Err():
-		g.geth.Fatalf("%v notification: %v", g.name, err)
-		break
-	case <-timeout:
-		g.geth.Fatalf("%v timeout syncing", g.name)
-		break
-	}
-}
-
 // ipcEndpoint resolves an IPC endpoint based on a configured value, taking into
 // account the set data folders as well as the designated platform we're currently
 // running on.