[#1375] neofs-adm: Do not update NNS group if the key is the same

If the group key is already set, do not send any transactions.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

CHANGELOG.md

@@ -8,6 +8,7 @@ Changelog for NeoFS Node
 
 ### Fixed
 - Do not ask for contract wallet password twice (#1346)
+- Do not update NNS group if the key is the same (#1375)
 
 ## [0.28.1] - 2022-05-05
 

cmd/neofs-adm/internal/modules/morph/initialize_nns.go

@@ -83,7 +83,7 @@ func (c *initializeContext) setNNS() error {
 func (c *initializeContext) updateNNSGroup(nnsHash util.Uint160, pub *keys.PublicKey) error {
 	bw := io.NewBufBinWriter()
 	sysFee, err := c.emitUpdateNNSGroupScript(bw, nnsHash, pub)
-	if err != nil {
+	if err != nil || sysFee == 0 {
 		return err
 	}
 	return c.sendCommitteeTx(bw.Bytes(), sysFee, true)