staging: unisys: Modify boolean assignment

Boolean variables should be assigned true/false rather than 1/0.
This patch makes a correction on such a variable which has boolean
values assigned in all other places within the file.

Signed-off-by: Janani Ravichandran <janani.rvchndrn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>