!101 iSulad: fix umount dev tmpfs bug

Merge pull request !101 from zhangsong234/master

iSulad.spec

 %global _version 1.1.12
-%global _release 20200306.143730.gitb83d1ed8
+%global _release 20200311.212052.git8d13b09e
 %global is_systemd 1
 %global debug_package %{nil}
 

src/services/execution/execute/execution.c

@@ -255,7 +255,7 @@ static int umount_dev_tmpfs_for_system_container(const container_t *cont)
             ERROR("Out of memory");
             return -1;
         }
-        if (umount(rootfs_dev_path) < 0 && errno != EINVAL) {
+        if (umount(rootfs_dev_path) < 0 && errno != ENOENT) {
             ERROR("Failed to umount dev tmpfs: %s, error: %s", rootfs_dev_path, strerror(errno));
             return -1;
         }