qdev-monitor: fix error message in find_device_state()

This "hotpluggable" here is misleading. Actually we check is object a
device or not. Let's drop the word.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20240329183758.3360733-3-vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

system/qdev-monitor.c

@@ -891,7 +891,7 @@ static DeviceState *find_device_state(const char *id, Error **errp)
 
     dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
     if (!dev) {
-        error_setg(errp, "%s is not a hotpluggable device", id);
+        error_setg(errp, "%s is not a device", id);
         return NULL;
     }