fix defer on nil object

cmd/clairctl/clair/analyze.go

@@ -47,11 +47,10 @@ func analyzeLayer(id string) (v1.LayerEnvelope, error) {
 
 	lURI := fmt.Sprintf("%v/layers/%v?vulnerabilities", uri, id)
 	response, err := http.Get(lURI)
-	defer response.Body.Close()
-
 	if err != nil {
 		return v1.LayerEnvelope{}, fmt.Errorf("analysing layer %v: %v", id, err)
 	}
+	defer response.Body.Close()
 
 	var analysis v1.LayerEnvelope
 	err = json.NewDecoder(response.Body).Decode(&analysis)

cmd/clairctl/clair/health.go

@@ -10,12 +10,11 @@ import (
 func IsHealthy() bool {
 	logrus.Debugln("requesting health on: " + healthURI)
 	response, err := http.Get(healthURI)
-	defer response.Body.Close()
-
 	if err != nil {
 		logrus.Errorf("requesting Clair health: %v", err)
 		return false
 	}
+	defer response.Body.Close()
 
 	if response.StatusCode != http.StatusOK {
 		return false

cmd/clairctl/clair/push.go

@@ -89,11 +89,11 @@ func pushLayer(layer v1.LayerEnvelope) error {
 	request.Header.Set("Content-Type", "application/json")
 
 	response, err := (&http.Client{}).Do(request)
-	defer response.Body.Close()
 
 	if err != nil {
 		return fmt.Errorf("pushing layer to clair: %v", err)
 	}
+	defer response.Body.Close()
 
 	if response.StatusCode != 201 {
 		if response.StatusCode == 422 {

cmd/clairctl/clair/versions.go

@@ -9,10 +9,10 @@ import (
 func Versions() (interface{}, error) {
 	Config()
 	response, err := http.Get(uri + "/versions")
-	defer response.Body.Close()
 	if err != nil {
 		return nil, fmt.Errorf("requesting Clair version: %v", err)
 	}
+	defer response.Body.Close()
 
 	var versionBody interface{}
 	err = json.NewDecoder(response.Body).Decode(&versionBody)

cmd/clairctl/docker/dockerdist/auth.go

@@ -52,11 +52,11 @@ func AuthenticateResponse(client *http.Client, dockerResponse *http.Response, re
 	req.SetBasicAuth(authConfig.Username, authConfig.Password)
 
 	response, err := client.Do(req)
-	defer response.Body.Close()
 
 	if err != nil {
 		return err
 	}
+	defer response.Body.Close()
 
 	if response.StatusCode == http.StatusUnauthorized {
 		return ErrUnauthorized