blockdev: Use BlockBackend to resize in qmp_block_resize()
In order to be able to do permission checking and to keep working with the BdrvChild based bdrv_truncate() that this involves, we need to create a temporary BlockBackend to resize the image. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com>
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