libctf: don't lose track of all valid types upon serialization

One pattern which is rarely done in libctf but which is meant to work is
this:

ctf_create();
ctf_add_*(); // add stuff
ctf_type_*() // look stuff up
ctf_write_*();
ctf_add_*(); // should still work
ctf_type_*() // so should this
ctf_write_*(); // and this

i.e., writing out a dict should not break it and you should be able to
do everything you could do with it before, including writing it out
again.

Unfortunately this has been broken for a while because the field which
indicates the maximum valid type ID was not preserved across
serialization: so type additions after serialization would overwrite
types (obviously disastrous) and type lookups would just fail.

Fix trivial.

libctf/ChangeLog
2021-03-18  Nick Alcock  <nick.alcock@oracle.com>

	* ctf-serialize.c (ctf_serialize): Preserve ctf_typemax across
	serialization.

1 files changed, 5 insertions, 0 deletions

diff --git a/libctf/ChangeLog b/libctf/ChangeLog
index 3eff44c..c274641 100644
--- a/libctf/ChangeLog
+++ b/libctf/ChangeLog
@@ -1,5 +1,10 @@
 2021-03-18  Nick Alcock  <nick.alcock@oracle.com>
 
+	* ctf-serialize.c (ctf_serialize): Preserve ctf_typemax across
+	serialization.
+
+2021-03-18  Nick Alcock  <nick.alcock@oracle.com>
+
 	* ctf-impl.h (ctf_dtdef_t) <dtd_u.dtu_argv>: Remove.
 	* ctf-create.c (ctf_dtd_delete): No longer free it.
 	(ctf_add_function): Use the dtd_vlen, not dtu_argv.  Properly align.