Fix linting errors - check error returns from Close()

- Wrap defer Close() calls to explicitly ignore errors
- Satisfies errcheck linter
- internal/client/client.go: resp.Body.Close() and out.Close()
- internal/client/fetcher.go: resp.Body.Close()

Author: kipz

internal/client/client.go

@@ -360,7 +360,7 @@ func downloadFile(url, destPath string) error {
 	if err != nil {
 		return err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != http.StatusOK {
 		return fmt.Errorf("HTTP %d: %s", resp.StatusCode, resp.Status)
@@ -370,7 +370,7 @@ func downloadFile(url, destPath string) error {
 	if err != nil {
 		return err
 	}
-	defer out.Close()
+	defer func() { _ = out.Close() }()
 
 	_, err = io.Copy(out, resp.Body)
 	return err

internal/client/fetcher.go

@@ -64,7 +64,7 @@ func (f *FilesystemFetcher) DownloadFile(urlPath string, maxLength int64, _ time
 	if err != nil {
 		return nil, err
 	}
-	defer resp.Body.Close()
+	defer func() { _ = resp.Body.Close() }()
 
 	if resp.StatusCode != http.StatusOK {
 		return nil, &metadata.ErrDownloadHTTP{StatusCode: resp.StatusCode, URL: urlPath}