eth/tracers/logger: fix nit re empty lists vs nil

eth/tracers/logger/logger.go

@@ -222,6 +222,7 @@ func NewStreamingStructLogger(cfg *Config, writer io.Writer) *StructLogger {
 func NewStructLogger(cfg *Config) *StructLogger {
 	logger := &StructLogger{
 		storage: make(map[common.Address]Storage),
+		logs:    make([]json.RawMessage, 0),
 	}
 	if cfg != nil {
 		logger.cfg = *cfg
@@ -238,14 +239,6 @@ func (l *StructLogger) Hooks() *tracing.Hooks {
 	}
 }
 
-// Reset clears the data held by the logger.
-func (l *StructLogger) Reset() {
-	l.storage = make(map[common.Address]Storage)
-	l.output = make([]byte, 0)
-	l.logs = l.logs[:0]
-	l.err = nil
-}
-
 // OnOpcode logs a new structured log message and pushes it out to the environment
 //
 // OnOpcode also tracks SLOAD/SSTORE ops to track storage change.