s4:dsdb/repl: let drepl_out_helpers.c always go via dreplsrv_out_drsuapi_send()
I have customer backtraces showing that 'drsuapi' is NULL in
dreplsrv_op_pull_source_get_changes_trigger() called from the
WERR_DS_DRA_SCHEMA_MISMATCH retry case of
dreplsrv_op_pull_source_apply_changes_trigger(), while 'drsuapi' was
a valid pointer there.
From reading the code I don't understand how this can happen,
but it does very often on RODCs. And this fix prevents the problem.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15573
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>