Convert the few instances of int32 there were to int32_t.

Signed-off-by: Richard Sharpe <rsharpe@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Sat May 16 03:09:12 CEST 2015 on sn-devel-104
