Description of problem:

matchpathcon needs /etc/selinux/targeted/contexts/files/file_contexts from
selinux-policy-targeted package to work. When it's not present, it fails, and
crashes when dereferencing the handle it failed to initialize before.

Version-Release number of selected component (if applicable):

libselinux-2.0.34-3.fc8

How reproducible:


Steps to Reproduce:
1. ensure that you don't have selinux-policy-targeted package
2. matchpathcon /dev/null
  
Actual results:

open("/etc/selinux/targeted/contexts/files/file_contexts", O_RDONLY|O_LARGEFILE)
= -1 ENOENT (No such file or directory)
write(2, "matchpathcon(/mnt) failed: No su"..., 53matchpathcon(/mnt) failed: No
such file or directory
) = 53
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV (core dumped) +++

Additional info:

I attach the patch to prevent the segfault. Additionaly, maybe it would be a
good idea if libselinux depended on selinux-policy-targeted.