comedi: das6402: Fix bit shift out of bounds

In the Linux kernel, the following vulnerability has been resolved:

comedi: das6402: Fix bit shift out of bounds

When checking for a supported IRQ number, the following test is used:

/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */

if ((1 << it->options[1]) & 0x8cec) {

However, `it->options[i]` is an unchecked `int` value from userspace, so

the shift amount could be negative or out of bounds. Fix the test by

requiring `it->options[1]` to be within bounds before proceeding with

the original test. Valid `it->options[1]` values that select the IRQ

will be in the range [1,15]. The value 0 explicitly disables the use of

interrupts.