style: various linting fixes (#15675)

## Description

fix various linting issues

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

* [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
* [ ] added `!` to the type prefix if API or client breaking change
* [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
* [ ] provided a link to the relevant issue or specification
* [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/docs/building-modules)
* [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
* [ ] added a changelog entry to `CHANGELOG.md`
* [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
* [ ] updated the relevant documentation or specification
* [ ] reviewed "Files changed" and left comments if necessary
* [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

* [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
* [ ] confirmed `!` in the type prefix if API or client breaking change
* [ ] confirmed all author checklist items have been addressed 
* [ ] reviewed state machine logic
* [ ] reviewed API design and naming
* [ ] reviewed documentation is accurate
* [ ] reviewed tests and test coverage
* [ ] manually tested (if applicable)

codec/proto_codec.go

@@ -300,13 +300,12 @@ func (pc *ProtoCodec) GetMsgV1Signers(msg gogoproto.Message) ([]string, proto.Me
 	if msgV2, ok := msg.(proto.Message); ok {
 		signers, err := pc.getSignersCtx.GetSigners(msgV2)
 		return signers, msgV2, err
-	} else {
-		a, err := types.NewAnyWithValue(msg)
-		if err != nil {
-			return nil, nil, err
-		}
-		return pc.GetMsgAnySigners(a)
 	}
+	a, err := types.NewAnyWithValue(msg)
+	if err != nil {
+		return nil, nil, err
+	}
+	return pc.GetMsgAnySigners(a)
 }
 
 // GRPCCodec returns the gRPC Codec for this specific ProtoCodec