Fix typo

Signed-off-by: Jon Huhn <huhnjon@gmail.com>

cmd/helm/lint.go

@@ -166,7 +166,7 @@ func lintChart(path string, vals []byte, namespace string, strict bool) (support
 		chartPath = path
 	}
 
-	// Guard: Error out of this is not a chart.
+	// Guard: Error out if this is not a chart.
 	if _, err := os.Stat(filepath.Join(chartPath, "Chart.yaml")); err != nil {
 		return linter, errLintNoChart
 	}