[NET]: Clean up comments for sk_chk_filter()

 * no references or jumps that are out of range, no illegal

 * instructions, and must end with a RET instruction.

 *

 * Returns 0 if the rule set is legal or a negative errno code if not.

 * All jumps are forward as they are not signed.

 *

 * Returns 0 if the rule set is legal or -EINVAL if not.

 */

int sk_chk_filter(struct sock_filter *filter, int flen)

{

	/* check the filter code now */

	for (pc = 0; pc < flen; pc++) {

		/* all jumps are forward as they are not signed */

		ftest = &filter[pc];

		/* Only allow valid instructions */

		}

	}

	/*

	 * The program must end with a return. We don't care where they

	 * jumped within the script (its always forwards) but in the end

	 * they _will_ hit this.

	 */

        return (BPF_CLASS(filter[flen - 1].code) == BPF_RET) ? 0 : -EINVAL;

}