Use the correct length parameter when using strlcpy with substrings. Fixes the...

Use the correct length parameter when using strlcpy with substrings. Fixes the problem reported on the forum (http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=11749)


git-svn-id: http://root.cern.ch/svn/root/trunk@37379 27541ba8-7e3a-0410-8455-c3a389f83636