Fix multiple credentials in route53 (#2859)

plugin/route53/setup.go

@@ -35,6 +35,7 @@ func init() {
 }
 
 func setup(c *caddy.Controller, f func(*credentials.Credentials) route53iface.Route53API) error {
+	for c.Next() {
 		keyPairs := map[string]struct{}{}
 		keys := map[string][]string{}
 
@@ -49,7 +50,7 @@ func setup(c *caddy.Controller, f func(*credentials.Credentials) route53iface.Ro
 		var fall fall.F
 
 		up := upstream.New()
-	for c.Next() {
+
 		args := c.RemainingArgs()
 
 		for i := 0; i < len(args); i++ {
@@ -99,9 +100,7 @@ func setup(c *caddy.Controller, f func(*credentials.Credentials) route53iface.Ro
 				return c.Errf("unknown property '%s'", c.Val())
 			}
 		}
-	}
 		providers = append(providers, &credentials.EnvProvider{}, sharedProvider)
-
 		client := f(credentials.NewChainCredentials(providers))
 		ctx := context.Background()
 		h, err := New(ctx, client, keys, up)
@@ -116,6 +115,6 @@ func setup(c *caddy.Controller, f func(*credentials.Credentials) route53iface.Ro
 			h.Next = next
 			return h
 		})
-
+	}
 	return nil
 }