!1014 Fix : OsLs内存问题修复挑单到monthly_20221018

Merge pull request !1014 from yinjiaming/cherry-pick-1673836500

components/shell/src/cmds/vfs_shellcmd.c

@@ -181,6 +181,7 @@ VOID OsLs(const CHAR *pathname)
     d = opendir(path);
     if (d == NULL) {
         PRINT_ERR("No such directory = %s\n", path);
+        free(path);
     } else {
         PRINTK("Directory %s:\n", path);
         do {