vhost: fix TUN=m VHOST_NET=y

	drivers/built-in.o: In function `get_tun_socket':
	net.c:(.text+0x15436e): undefined reference to `tun_get_socket'

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 drivers/vhost/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -1,6 +1,6 @@
 config VHOST_NET
 	tristate "Host kernel accelerator for virtio net (EXPERIMENTAL)"
-	depends on NET && EVENTFD && EXPERIMENTAL
+	depends on NET && EVENTFD && TUN && EXPERIMENTAL
 	---help---
 	  This kernel module can be loaded in host kernel to accelerate
 	  guest networking with virtio_net. Not to be confused with virtio_net