rejected: User unknown in virtual mailbox table

The address found in drivers/staging/xgifb/TODO seems to work better.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: arnaud.patard@rtp-net.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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