libqtest: Clean up how we read device_del messages
qtest_qmp_device_del() still uses the qmp("") hack to receive a
message, even though we have qmp_receive() since commit 66e0c7b187
.
Put it to use.
Bonus: gets rid of empty format strings. A step towards compile-time
format string checking without triggering -Wformat-zero-length.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180806065344.7103-3-armbru@redhat.com>
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@ -1090,7 +1090,7 @@ void qtest_qmp_device_del(const char *id)
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g_assert(response1);
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g_assert(!qdict_haskey(response1, "error"));
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response2 = qmp("");
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response2 = qmp_receive();
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g_assert(response2);
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g_assert(!qdict_haskey(response2, "error"));
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