This commit fixes undefined initial value of slice capability.
When unset it could lead to undefined read of capability due to
stack frame picked values, is should therefore be set to 0.
Fixes: b3cbbcdffa ("common/qat: read HW slice configuration")
Signed-off-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
Acked-by: Kai Ji <kai.ji@intel.com>