Fixed bug in smartctl pointed out by Gregory Goddard

<ggoddard@ufl.edu>.  Manual says that bit 6 of return
value turned on if errors found in smart error log.  But
this wasn't implemented.


git-svn-id: https://smartmontools.svn.sourceforge.net/svnroot/smartmontools/trunk@455 4ea69e1a-61f1-4043-bf83-b5c94c648137