block: use correct filename
The content filename point to may be erased by qemu_opts_absorb_qdict() in raw_open_common() in drv->bdrv_file_open() So it's better to use bs->filename. Signed-off-by: NDunrong Huang <riegamaths@gmail.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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