order add promotion

go/gopath/src/fohow.com/apps/helpers/promotion_helper.go

@@ -114,7 +114,7 @@ func max(vals ...int64) int64 {
 func min(vals ...int64) int64 {
 	var min int64
 	for _, val := range vals {
-		if min == 0 || val <= min {
+		if val <= min {
 			min = val
 		}
 	}