V4L/DVB (3965): Fix CONFIG_VIDEO_VIVI=y build bug

CONFIG_VIDEO_VIVI depends on CONFIG_VIDEO_BUF.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 9127917..7124e53 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -19,6 +19,7 @@
 config VIDEO_VIVI
 	tristate "Virtual Video Driver"
 	depends on VIDEO_V4L2 && !SPARC32 && !SPARC64
+	select VIDEO_BUF
 	default n
 	---help---
 	  Enables a virtual video driver. This device shows a color bar