fix build fail for hv_mouse indefine udelay

Fix build failure issue for hv_mouse
When build 2.6.39-rc1 kernel, it will be blocked at build hv_mouse.

  drivers/staging/hv/hv_mouse.c: In function ‘ReleaseInputDevice’:
  drivers/staging/hv/hv_mouse.c:293: error: implicit declaration of function ‘udelay’

Signed-off-by: Youquan Song <youquan.song@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/staging/hv/hv_mouse.c b/drivers/staging/hv/hv_mouse.c
index 50147f84741c..9c6d4d24f889 100644
--- a/drivers/staging/hv/hv_mouse.c
+++ b/drivers/staging/hv/hv_mouse.c
@@ -23,6 +23,7 @@
 #include <linux/hiddev.h>
 #include <linux/pci.h>
 #include <linux/dmi.h>
+#include <linux/delay.h>
 
 #include "hv_api.h"
 #include "logging.h"