Description of problem:
Current rpmlint is returning tracebacks if cwd doesn't exist.

Version-Release number of selected component (if applicable):
rpmlint-0.80-1.fc7

Steps to Reproduce:
1. mkdir tmp
2. cd tmp
3. rmdir ../tmp
4. rpmlint <package>.rpm
  
Actual results:

rpmlint
/var/ftp/pub/linux/mirrors/download.fedora.redhat.com/pub/fedora/linux/updates/7/i386/agistudio-1.2.3-3.fc7.i386.rpm

shell-init: error retrieving current directory: getcwd: cannot access parent
directories: No such file or directory
shell-init: error retrieving current directory: getcwd: cannot access parent
directories: No such file or directory
E: agistudio zero-length /usr/share/agistudio/template/snddir
Traceback (most recent call last):
  File "/usr/share/rpmlint/rpmlint.py", line 270, in <module>
    main()
  File "/usr/share/rpmlint/rpmlint.py", line 92, in main
    runChecks(pkg)
  File "/usr/share/rpmlint/rpmlint.py", line 151, in runChecks
    c.check(pkg)
  File "/usr/share/rpmlint/BinariesCheck.py", line 148, in check
    info=pkg.getFilesInfo()
  File "/usr/share/rpmlint/Pkg.py", line 205, in getFilesInfo
    olddir = os.getcwd()
OSError: [Errno 2] No such file or directory


Expected results:
No traceback

Additional info: