Jindřich Makovička 3e5feb6202 qcow2: Handle EAGAIN returned from update_refcount
Fixes a crash during image compression

Signed-off-by: Jindřich Makovička <makovick@gmail.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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