QemuOpts: Simplify qemu_opts_to_qdict()

Noticed while investigating Coccinelle cleanups. There is no need
for a temporary variable when we can use the new macro to do the
same thing with less typing.
Signed-off-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Message-Id: <20170427215821.19397-9-eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

util/qemu-option.c

@@ -1054,7 +1054,6 @@ void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp)
 QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
 {
     QemuOpt *opt;
-    QObject *val;
 
     if (!qdict) {
         qdict = qdict_new();
@@ -1063,8 +1062,7 @@ QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict)
         qdict_put_str(qdict, "id", opts->id);
     }
     QTAILQ_FOREACH(opt, &opts->head, next) {
-        val = QOBJECT(qstring_from_str(opt->str));
-        qdict_put_obj(qdict, opt->name, val);
+        qdict_put_str(qdict, opt->name, opt->str);
     }
     return qdict;
 }