build: enable unconvert linter (#15456)

* build: enable unconvert linter

 - fixes #15453
 - update code base for failing cases

* cmd/puppeth: replace syscall.Stdin with os.Stdin.Fd() for unconvert linter

2 files changed, 3 insertions, 3 deletions

diff --git a/whisper/whisperv6/topic.go b/whisper/whisperv6/topic.go
index 5ef7f6939..bf5da01e3 100644
--- a/whisper/whisperv6/topic.go
+++ b/whisper/whisperv6/topic.go
@@ -40,8 +40,8 @@ func BytesToTopic(b []byte) (t TopicType) {
 }
 
 // String converts a topic byte array to a string representation.
-func (topic *TopicType) String() string {
-	return string(common.ToHex(topic[:]))
+func (t *TopicType) String() string {
+	return common.ToHex(t[:])
 }
 
 // MarshalText returns the hex representation of t.
diff --git a/whisper/whisperv6/whisper.go b/whisper/whisperv6/whisper.go
index 553ac3f00..e2b884f3d 100644
--- a/whisper/whisperv6/whisper.go
+++ b/whisper/whisperv6/whisper.go
@@ -171,7 +171,7 @@ func (w *Whisper) SetMaxMessageSize(size uint32) error {
 	if size > MaxMessageSize {
 		return fmt.Errorf("message size too large [%d>%d]", size, MaxMessageSize)
 	}
-	w.settings.Store(maxMsgSizeIdx, uint32(size))
+	w.settings.Store(maxMsgSizeIdx, size)
 	return nil
 }