vhost: fix return code for log_access_ok()

access_ok() returns 1 if it's OK otherwise it should return 0.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

drivers/vhost/vhost.c

@@ -371,7 +371,7 @@ static int log_access_ok(void __user *log_base, u64 addr, unsigned long sz)
 	/* Make sure 64 bit math will not overflow. */
 	if (a > ULONG_MAX - (unsigned long)log_base ||
 	    a + (unsigned long)log_base > ULONG_MAX)
-		return -EFAULT;
+		return 0;
 
 	return access_ok(VERIFY_WRITE, log_base + a,
 			 (sz + VHOST_PAGE_SIZE * 8 - 1) / VHOST_PAGE_SIZE / 8);