io_uring/zcrx: replace memchar_inv with is_zero

memchr_inv() is more ambiguous than mem_is_zero(), so use the latter
for zero checks.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: isilence

io_uring/zcrx.c

@@ -566,7 +566,7 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
 		return -EFAULT;
 	if (copy_from_user(&rd, u64_to_user_ptr(reg.region_ptr), sizeof(rd)))
 		return -EFAULT;
-	if (memchr_inv(&reg.__resv, 0, sizeof(reg.__resv)) ||
+	if (!mem_is_zero(&reg.__resv, sizeof(reg.__resv)) ||
 	    reg.__resv2 || reg.zcrx_id)
 		return -EINVAL;
 	if (reg.if_rxq == -1 || !reg.rq_entries || reg.flags)