raw-posix: Handle errors in raw_create
In qemu-iotests, some large images are created using qemu-img. Without checks for errors, qemu-img will just create an empty image, and later read / write tests will fail. With the patch, failures during image creation are detected and reported. Signed-off-by: NStefan Weil <weil@mail.berlios.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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