qdev: show name of device that fails init

When initialising a device fails, show the name of the failing device.

The current behaviour is to silently exit on such errors.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/qdev.c b/hw/qdev.c
index 86cf81b..b2d11ce 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -215,6 +215,7 @@
         return NULL;
     }
     if (qdev_init(qdev) != 0) {
+        qemu_error("Error initializing device %s\n", driver);
         qdev_free(qdev);
         return NULL;
     }