hmp: Cache use of qapi visitor
Cache the visitor in a local variable instead of repeatedly calling the accessor. Signed-off-by: NEric Blake <eblake@redhat.com> Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1454075341-13658-8-git-send-email-eblake@redhat.com> Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
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