9pfs: xattr: fix memory leak in v9fs_list_xattr

Free 'orig_value' in error path.
Signed-off-by: NLi Qiang <liqiang6-s@360.cn>
Signed-off-by: NGreg Kurz <groug@kaod.org>

hw/9pfs/9p-xattr.c

@@ -108,6 +108,7 @@ ssize_t v9fs_list_xattr(FsContext *ctx, const char *path,
     g_free(name);
     close_preserve_errno(dirfd);
     if (xattr_len < 0) {
+        g_free(orig_value);
         return -1;
     }