staging: crystalhd: return true and false instead of 1 and 0

This fixes coccinelle error regarding functions that return
bool and return 1 and 0 instead of true and false.

Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>