[PATCH] scsi: fix the build warning

[zwu . kernel]

From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>

  Initialize csum variable to fix the build warning.

drivers/scsi/scsi_debug.c: In function âdif_verifyâ:
drivers/scsi/scsi_debug.c:1755:3: warning: âcsumâ may be used uninitialized in this function [-Wmaybe-uninitialized]
  LD      drivers/built-in.o
  CHK     include/generated/uapi/linux/version.h
make[2]: Nothing to be done for `all'.
make[2]: Nothing to be done for `relocs'.

Signed-off-by: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
---
 drivers/scsi/scsi_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index cb4fefa..50d70c3 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1733,7 +1733,7 @@ static int do_device_access(struct scsi_cmnd *scmd,
 
 static u16 dif_compute_csum(const void *buf, int len)
 {
-	u16 csum;
+	u16 csum = -1;
 
 	switch (scsi_debug_guard) {
 	case 1:
-- 
1.7.11.7

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