lndcfg: give verbose err when failed to load config

cmd/lnd/main.go

@@ -23,6 +23,7 @@ func main() {
 	if err != nil {
 		if e, ok := err.(*flags.Error); !ok || e.Type != flags.ErrHelp {
 			// Print error if not due to help request.
+			err = fmt.Errorf("failed to load config: %w", err)
 			_, _ = fmt.Fprintln(os.Stderr, err)
 			os.Exit(1)
 		}

lncfg/address.go

@@ -35,7 +35,8 @@ func NormalizeAddresses(addrs []string, defaultPort string,
 			addr, defaultPort, tcpResolver,
 		)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("parse address %s failed: %w",
+				addr, err)
 		}
 
 		if _, ok := seen[parsedAddr.String()]; !ok {