client: remove redundant/repeated code (#8182)

Follows up PR #4876 which removed the return on non-nil errors
to always return a non-nil REST response regardless of error.
The checks performed seem benign and the return result is the
same.
This change uses the reverse conditional refactoring method
to gut out nesting and many conditions.
Noticed while hunting through types.ParseABCILogs.

Fixes #8181

client/broadcast.go

@@ -95,23 +95,14 @@ func (ctx Context) BroadcastTxCommit(txBytes []byte) (*sdk.TxResponse, error) {
 	}
 
 	res, err := node.BroadcastTxCommit(context.Background(), txBytes)
-	if err != nil {
-		if errRes := CheckTendermintError(err, txBytes); errRes != nil {
-			return errRes, nil
-		}
-
-		return sdk.NewResponseFormatBroadcastTxCommit(res), err
-	}
-
-	if !res.CheckTx.IsOK() {
+	if err == nil {
 		return sdk.NewResponseFormatBroadcastTxCommit(res), nil
 	}
 
-	if !res.DeliverTx.IsOK() {
-		return sdk.NewResponseFormatBroadcastTxCommit(res), nil
+	if errRes := CheckTendermintError(err, txBytes); errRes != nil {
+		return errRes, nil
 	}
-
-	return sdk.NewResponseFormatBroadcastTxCommit(res), nil
+	return sdk.NewResponseFormatBroadcastTxCommit(res), err
 }
 
 // BroadcastTxSync broadcasts transaction bytes to a Tendermint node