pkg/opts: Close the file handle

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)

pkg/opts/envfile.go

@@ -15,6 +15,8 @@ func ParseEnvFile(filename string) ([]string, error) {
 	if err != nil {
 		return []string{}, err
 	}
+  defer fh.Close()
+
 	var (
 		lines       []string = []string{}
 		line, chunk []byte