[fix] service discovery : change var "eps" to "pod

Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>

discovery/kubernetes/pod.go

@@ -124,12 +124,12 @@ func (p *Pod) process(ctx context.Context, ch chan<- []*targetgroup.Group) bool
 		send(ctx, ch, &targetgroup.Group{Source: podSourceFromNamespaceAndName(namespace, name)})
 		return true
 	}
-	eps, err := convertToPod(o)
+	pod, err := convertToPod(o)
 	if err != nil {
 		level.Error(p.logger).Log("msg", "converting to Pod object failed", "err", err)
 		return true
 	}
-	send(ctx, ch, p.buildPod(eps))
+	send(ctx, ch, p.buildPod(pod))
 	return true
 }