Assign true or false to boolean variables instead of an integer value.

This issue was detected with the help of Coccinelle.
Acked-by: NJohn Youn <johnyoun@synopsys.com>
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>