policycoreutils/hll/pp: Fix pp crash when processing base module

Policy module structure created by libsepol out of base module
contains NULL in module name, which results in segfault in "pp"
compiler. Add NULL check.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1350806

Signed-off-by: Vit Mojzis <vmojzis@redhat.com>
1 file changed