hw: qdev: fix error in comment

Cc: qemu-trivial@nongnu.org

Signed-off-by: Li Qiang <liq3ea@163.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20181030151637.37207-1-liq3ea@163.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

include/hw/qdev-core.h

@@ -197,7 +197,7 @@ typedef struct BusChild {
 
 /**
  * BusState:
- * @hotplug_device: link to a hotplug device associated with bus.
+ * @hotplug_handler: link to a hotplug handler associated with bus.
  */
 struct BusState {
     Object obj;