iotests: Fix reference output for 059

It was broken by efaa7c4eeb7 when it dropped the device name "image"
from BB API.  Now this error message text is updated again, sync it up.

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 20170119130759.28319-3-famz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/tests/qemu-iotests/059.out b/tests/qemu-iotests/059.out
index 678adb4..19bd50d 100644
--- a/tests/qemu-iotests/059.out
+++ b/tests/qemu-iotests/059.out
@@ -2361,5 +2361,5 @@
 0x140000000     0x10000         0x50000         TEST_DIR/iotest-version3-s003.vmdk
 
 === Testing afl image with a very large capacity ===
-qemu-img: Can't get size of device 'image': File too large
+qemu-img: Can't get image size 'TEST_DIR/afl9.IMGFMT': File too large
 *** done