fix memory swap issue

internal/pkg/checks/memory.go

@@ -1,6 +1,7 @@
 package checks
 
 import (
+	"fmt"
 	"github.com/mackerelio/go-osstat/memory"
 )
 
@@ -15,12 +16,18 @@ type Memory struct {
 
 func (h Memory) Execute() (ok bool, data interface{}, err error) {
 	memory, err := memory.Get()
+	fmt.Println(memory)
 	p := float64(100) / float64(memory.Total) * float64(memory.Used)
 	ps :=  float64(100) / float64(memory.SwapTotal) * float64(memory.SwapUsed)
 	res := make(map[string]interface{})
 	res["row"] = memory
 	res["ram"] = p
 	res["swap"] = ps
+	if memory.SwapTotal == 0 {
+		res["swap"] = 100
+	}
+
+	fmt.Println(ps)
 	if p > h.Config.Max {
 		return false, res, nil
 	}