lkdtm/fortify: Swap memcpy() for strncpy()

	strscpy(src, "over ten bytes", size);

	size = strlen(src) + 1;

	pr_info("trying to strcpy past the end of a member of a struct\n");

	pr_info("trying to strncpy past the end of a member of a struct\n");

	/*

	 * memcpy(target.a, src, 20); will hit a compile error because the

	 * strncpy(target.a, src, 20); will hit a compile error because the

	 * compiler knows at build time that target.a < 20 bytes. Use a

	 * volatile to force a runtime error.

	 */

	memcpy(target.a, src, size);

	strncpy(target.a, src, size);

	/* Store result to global to prevent the code from being eliminated */

	fortify_scratch_space = target.a[3];