[SCSI] replace sizeof sense_buffer with SCSI_SENSE_BUFFERSIZE

This replaces sizeof sense_buffer with SCSI_SENSE_BUFFERSIZE in
several LLDs. It's a preparation for the future changes to remove
sense_buffer array in scsi_cmnd structure.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 2886407..c94906a 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -528,7 +528,7 @@
 #define	CMD_CDBLEN(Cmnd)	Cmnd->cmd_len
 #define	CMD_CDBP(Cmnd)		Cmnd->cmnd
 #define	CMD_SNSP(Cmnd)		Cmnd->sense_buffer
-#define	CMD_SNSLEN(Cmnd)	sizeof(Cmnd->sense_buffer)
+#define	CMD_SNSLEN(Cmnd)	SCSI_SENSE_BUFFERSIZE
 #define	CMD_RESULT(Cmnd)	Cmnd->result
 #define	CMD_HANDLE(Cmnd)	Cmnd->host_scribble
 #define CMD_REQUEST(Cmnd)	Cmnd->request->cmd
@@ -3715,7 +3715,7 @@
 			} else
 				sense_sz = 0;
 			memset(cmd->sense_buffer + sense_sz, 0,
-			       sizeof(cmd->sense_buffer) - sense_sz);
+			       SCSI_SENSE_BUFFERSIZE - sense_sz);
 
 			dprintk(2, "qla1280_status_entry: Check "
 				"condition Sense data, b %i, t %i, "