cirrus_vga: make cirrus_read_hidden_dac() return its result
Signed-off-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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Signed-off-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>