ci: improve error checking (errcheck linter) (#11195)

## Description

Implements part of #7258

Check some of currently unchecked errors.

- [x] baseapp
- [x] client
- [x] codec
- [x] crypto
- [x] server
- [x] simapp
- [ ] snapshots
- [ ] store
- [x] testutil
- [ ] types
- [ ] modules

---

### 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/master/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/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/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)

baseapp/baseapp_test.go

@@ -64,7 +64,9 @@ func (ps *paramStore) Set(_ sdk.Context, key []byte, value interface{}) {
 		panic(err)
 	}
 
-	ps.db.Set(key, bz)
+	if err := ps.db.Set(key, bz); err != nil {
+		panic(err)
+	}
 }
 
 func (ps *paramStore) Has(_ sdk.Context, key []byte) bool {
@@ -183,7 +185,7 @@ func setupBaseAppWithSnapshots(t *testing.T, blocks uint, blockTxs int, options
 	snapshotStore, err := snapshots.NewStore(dbm.NewMemDB(), snapshotDir)
 	require.NoError(t, err)
 	teardown := func() {
-		os.RemoveAll(snapshotDir)
+		_ = os.RemoveAll(snapshotDir)
 	}
 
 	app := setupBaseApp(t, append(options,
@@ -287,7 +289,8 @@ func TestConsensusParamsNotNil(t *testing.T) {
 	app.EndBlock(abci.RequestEndBlock{Height: header.Height})
 	app.CheckTx(abci.RequestCheckTx{})
 	app.DeliverTx(abci.RequestDeliverTx{})
-	app.Simulate([]byte{})
+	_, _, err := app.Simulate([]byte{})
+	require.NoError(t, err)
 }
 
 // Test that we can make commits and then reload old versions.

baseapp/grpcserver.go

@@ -61,7 +61,9 @@ func (app *BaseApp) RegisterGRPCServer(server gogogrpc.Server) {
 		grpcCtx = context.WithValue(grpcCtx, sdk.SdkContextKey, sdkCtx)
 
 		md = metadata.Pairs(grpctypes.GRPCBlockHeightHeader, strconv.FormatInt(height, 10))
-		grpc.SetHeader(grpcCtx, md)
+		if err = grpc.SetHeader(grpcCtx, md); err != nil {
+			app.logger.Error("failed to set gRPC header", "err", err)
+		}
 
 		return handler(grpcCtx, req)
 	}