iotests: Fix 059's reference output

As of commit 9877860e, vmdk fails
differently when opening the sample image.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Message-id: 20171123020832.8165-13-mreitz@redhat.com
Reviewed-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NMax Reitz <mreitz@redhat.com>

tests/qemu-iotests/059.out

@@ -2358,5 +2358,5 @@ Offset          Length          Mapped to       File
 0x140000000     0x10000         0x50000         TEST_DIR/t-s003.vmdk
 
 === Testing afl image with a very large capacity ===
-qemu-img: Can't get image size 'TEST_DIR/afl9.IMGFMT': File too large
+qemu-img: Could not open 'TEST_DIR/afl9.IMGFMT': Could not open 'TEST_DIR/afl9.IMGFMT': Invalid argument
 *** done