InitConfig accesses config.Releases without checking Init error

[zacharyblasczyk]

Description

In pkg/helm/chart.go:45-50, config.Releases.MaxHistory is set immediately after config.Init() without first checking if err is non-nil:

err := config.Init(
    settings.RESTClientGetter(),
    settings.Namespace(),
    secretsStorageDriver,
)
config.Releases.MaxHistory = maxReleasesToKeep
return settings, config, err

If Init fails and doesn't initialize the Releases field, this will panic with a nil pointer dereference. In practice Helm likely always initializes Releases, but this is technically unsafe error handling.

Suggested fix

if err != nil {
    return settings, config, err
}
config.Releases.MaxHistory = maxReleasesToKeep
return settings, config, nil

Found during review of #147.