arm64: don't zero in __copy_from_user{,_inatomic}

static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)

{

	unsigned long res = n;

	kasan_check_write(to, n);

	if (access_ok(VERIFY_READ, from, n)) {

		check_object_size(to, n, false);

		n = __arch_copy_from_user(to, from, n);

	} else /* security hole - plug it */

		memset(to, 0, n);

	return n;

		res = __arch_copy_from_user(to, from, n);

	}

	if (unlikely(res))

		memset(to + (n - res), 0, res);

	return res;

}

static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)

	.section .fixup,"ax"

	.align	2

9998:

	sub	x0, end, dst

9999:

	strb	wzr, [dst], #1			// zero remaining buffer space

	cmp	dst, end

	b.lo	9999b

9998:	sub	x0, end, dst			// bytes not copied

	ret

	.previous