eth/filters: replace atomic pointer with value (#26689)

* eth/filters: replace atomic.Pointer

* fix

* improve
Co-authored-by: Martin Holst Swende <martin@swende.se>

---------
Co-authored-by: Martin Holst Swende <martin@swende.se>

eth/filters/filter_system.go

@@ -95,7 +95,7 @@ func NewFilterSystem(backend Backend, config Config) *FilterSystem {
 
 type logCacheElem struct {
 	logs []*types.Log
-	body atomic.Pointer[types.Body]
+	body atomic.Value
 }
 
 // cachedLogElem loads block logs from the backend and caches the result.
@@ -133,7 +133,7 @@ func (sys *FilterSystem) cachedLogElem(ctx context.Context, blockHash common.Has
 
 func (sys *FilterSystem) cachedGetBody(ctx context.Context, elem *logCacheElem, hash common.Hash, number uint64) (*types.Body, error) {
 	if body := elem.body.Load(); body != nil {
-		return body, nil
+		return body.(*types.Body), nil
 	}
 	body, err := sys.backend.GetBody(ctx, hash, rpc.BlockNumber(number))
 	if err != nil {