[Git Patch] arch/um/drivers/ubd_kern.c: fix a building error

[WANG Cong]

Fix this uml building error:
arch/um/drivers/ubd_kern.c: In function 'do_ubd_request':
arch/um/drivers/ubd_kern.c:1118: error: implicit declaration of function 'sg_page'
arch/um/drivers/ubd_kern.c:1118: warning: passing argument 6 of 'prepare_request' makes pointer from integer without a cast
make[1]: *** [arch/um/drivers/ubd_kern.o] Error 1
make: *** [arch/um/drivers] Error 2

Signed-off-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>

---
 arch/um/drivers/ubd_kern.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 3a8cd3d..440ed25 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -35,6 +35,7 @@
 #include "linux/genhd.h"
 #include "linux/spinlock.h"
 #include "linux/platform_device.h"
+#include "linux/scatterlist.h"
 #include "asm/segment.h"
 #include "asm/uaccess.h"
 #include "asm/irq.h"
-
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