patch applied (packages/directory): Check for a NULL result from realpath; fixes #4113 on non-Windows

[Ian Lynagh]

Sun Jun 13 06:42:35 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Check for a NULL result from realpath; fixes #4113 on non-Windows

    M ./System/Directory.hs -1 +1

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/directory;a=darcs_commitdiff;h=20100613134235-3fd76-57ea60e9f750d0e67fb5397400afc5cb5bc83222.gz