libctf, dump: correctly dump non-root-visible types

The flag test when dumping non-root-visible tyeps was doubly wrong: the
flags word is a *bitfield* containing CTF_ADD_ROOT as one possible
value, so needs | and & testing, not just ==, and CTF_ADD_NONROOT is 0,
so cannot be tested for this way: one must check for the non-presence of
CTF_ADD_ROOT.

libctf/
	* ctf-dump.c (ctf_dump_format_type): Fix non-root flag test.

libctf/ctf-dump.c

diff --git a/libctf/ctf-dump.c b/libctf/ctf-dump.c
index 80a3b26..cd41996 100644
--- a/libctf/ctf-dump.c
+++ b/libctf/ctf-dump.c
@@ -106,7 +106,7 @@
       const char *idstr = "";
 
       id = new_id;
-      if (flag == CTF_ADD_NONROOT)
+      if (!(flag & CTF_ADD_ROOT))
 	{
 	  nonroot_leader = "{";
 	  nonroot_trailer = "}";