blockdev: Replace "undefined error" in qmp_block_resize
We have an errno value that can be displayed, so we should just do that. An easy way to reproduce this case is to resize a raw image to a size that is too large for the host file system. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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