ksmbd: use SOCK_NONBLOCK type for kernel_accept()

I found that normally it is O_NONBLOCK but there are different value
for some arch.

/include/linux/net.h:
#ifndef SOCK_NONBLOCK
#define SOCK_NONBLOCK   O_NONBLOCK
#endif

/arch/alpha/include/asm/socket.h:
#define SOCK_NONBLOCK   0x40000000

Use SOCK_NONBLOCK instead of O_NONBLOCK for kernel_accept().
Suggested-by: David Howells <dhowells@redhat.com>
Signed-off-by: Namjae Jeon <linkinjeon@kerne.org>
Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/transport_tcp.c

@@ -230,7 +230,7 @@ static int ksmbd_kthread_fn(void *p)
 			break;
 		}
 		ret = kernel_accept(iface->ksmbd_socket, &client_sk,
-				    O_NONBLOCK);
+				    SOCK_NONBLOCK);
 		mutex_unlock(&iface->sock_release_lock);
 		if (ret) {
 			if (ret == -EAGAIN)