Don't start a state restoration if it is not available.
Fortuitly discovered that $SECONDS is inherited from shell to sub-shells. Good!
1 Unless otherwise stated in individaul files, this work is licensed to you under
4 - Files in docs/ are available under the Creative Commons Attribution, Share
5 Alike (by-sa), v2.5, to be found there:
6 licenses.d/by-sa/deed.en (human-readable summary)
7 licenses.d/by-sa/legalcode (legal code, the full license)
9 - Files found in patches/uClibc/*/ are available under the GNU Lesser General
10 Public License (LGPL), v2.1, to be found there:
13 - Files found in patches/glibc/*/ are available under the GNU Lesser General
14 Public License (LGPL), v2.1, to be found there:
17 - Other files not covered by the above licenses, and not covered by an
18 individual license specified in the file itself, or an accompanying file,
19 are available under the GNU General Public License (GPL), v2, to be found