refparser: add missing newline after error message

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>

python/sepolgen/src/sepolgen/refparser.py

@@ -1148,6 +1148,6 @@ def parse_file(f, module, spt=None):
             status.step()
 
     if len(failures):
-        o("failed to parse some headers: %s" % ", ".join(failures))
+        o("failed to parse some headers: %s\n" % ", ".join(failures))
 
     return headers