qemu/qdev: type safety in reset handler

Add type safety to qdev reset handlers, by declaring them as
DeviceState * rather than void *.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/qdev.h b/hw/qdev.h
index 7da7837..893ae92 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -115,6 +115,7 @@
 
 typedef int (*qdev_initfn)(DeviceState *dev, DeviceInfo *info);
 typedef int (*qdev_event)(DeviceState *dev);
+typedef void (*qdev_resetfn)(DeviceState *dev);
 
 struct DeviceInfo {
     const char *name;
@@ -125,7 +126,7 @@
     int no_user;
 
     /* callbacks */
-    QEMUResetHandler *reset;
+    qdev_resetfn reset;
 
     /* device state */
     const VMStateDescription *vmsd;