Update drivers/139/driver.go

Co-authored-by: MadDogOwner <xiaoran@xrgzs.top>

Author: j2rong4cn

drivers/139/driver.go

@@ -787,6 +787,9 @@ func (d *Yun139) Put(ctx context.Context, dstDir model.Obj, stream model.FileStr
 		if size%partSize > 0 {
 			part++
 		}
+		if part == 0 {
+			part = 1
+		}
 		rateLimited := driver.NewLimitedUploadStream(ctx, stream)
 		for i := int64(0); i < part; i++ {
 			if utils.IsCanceled(ctx) {