Cleanup from Simon's comments

x/wasm/ioutils/utils.go

@@ -5,7 +5,7 @@ import (
 	"compress/gzip"
 )
 
-var (
+const (
 	// magic bytes to identify gzip.
 	// See https://www.ietf.org/rfc/rfc1952.txt
 	// and https://github.com/golang/go/blob/master/src/net/http/sniff.go#L186

x/wasm/keeper/snapshotter.go

@@ -89,17 +89,17 @@ func (ws *WasmSnapshotter) Snapshot(height uint64, protoWriter protoio.Writer) e
 	cacheMS := ws.cms.CacheMultiStore()
 
 	ctx := sdk.NewContext(cacheMS, tmproto.Header{}, false, log.NewNopLogger())
-	uniqueHashes := make(map[string]bool)
+	seenBefore := make(map[string]bool)
 	var rerr error
 
 	ws.wasm.IterateCodeInfos(ctx, func(id uint64, info types.CodeInfo) bool {
 		// Many code ids may point to the same code hash... only sync it once
 		hexHash := hex.EncodeToString(info.CodeHash)
-		// if uniqueHashes, just skip this one and move to the next
-		if uniqueHashes[hexHash] {
+		// if seenBefore, just skip this one and move to the next
+		if seenBefore[hexHash] {
 			return false
 		}
-		uniqueHashes[hexHash] = true
+		seenBefore[hexHash] = true
 
 		// load code and abort on error
 		wasmBytes, err := ws.wasm.GetByteCode(ctx, id)