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qapi: Fix regression with '-netdev help' 

Commit e36c714e causes 'qemu -netdev help' to dump core, because the
call to visit_end_union() is no longer conditional on whether *obj was
allocated.

Reported by Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1444861825-19256-1-git-send-email-eblake@redhat.com>
[Commit message tweaked to say 'help' instead of '?']
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-10-14 16:30:25 -06:00 committed by Markus Armbruster
parent c49d3411fa
commit d08ac81a45
1 changed files with 3 additions and 1 deletions
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4
scripts/qapi-visit.py
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@ -301,7 +301,9 @@ def gen_visit_union(name, base, variants):
out_obj:
error_propagate(errp, err);
err = NULL;
visit_end_union(v, !!(*obj)->data, &err);
if (*obj) {
visit_end_union(v, !!(*obj)->data, &err);
}
error_propagate(errp, err);
err = NULL;
visit_end_struct(v, &err);