checkpolicy: libselinux: Fix dead links to www.nsa.gov/selinux

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
diff --git a/checkpolicy/checkmodule.8 b/checkpolicy/checkmodule.8
index 473f642..40f73c5 100644
--- a/checkpolicy/checkmodule.8
+++ b/checkpolicy/checkmodule.8
@@ -53,7 +53,7 @@
 
 .SH "SEE ALSO"
 .B semodule(8), semodule_package(8)
-SELinux documentation at http://www.nsa.gov/selinux,
+SELinux documentation at http://www.nsa.gov/research/selinux,
 especially "Configuring the SELinux Policy".