[SCSI] correct some dropped const compiler warnings

Make the vendor, model and rev fields in scsi_device pointers to const
and update a few prototypes of functions using them.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/scsi_devinfo.c

@@ -354,8 +354,9 @@ static int scsi_dev_info_list_add_str(char *dev_list)
  *     @model, if found, return the matching flags value, else return
  *     the host or global default settings.
  **/
-int scsi_get_device_flags(struct scsi_device *sdev, unsigned char *vendor,
-			  unsigned char *model)
+int scsi_get_device_flags(struct scsi_device *sdev,
+			  const unsigned char *vendor,
+			  const unsigned char *model)
 {
 	struct scsi_dev_info_list *devinfo;
 	unsigned int bflags;

drivers/scsi/scsi_priv.h

@@ -57,7 +57,8 @@ static inline void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
 
 /* scsi_devinfo.c */
 extern int scsi_get_device_flags(struct scsi_device *sdev,
-				 unsigned char *vendor, unsigned char *model);
+				 const unsigned char *vendor,
+				 const unsigned char *model);
 extern int __init scsi_init_devinfo(void);
 extern void scsi_exit_devinfo(void);
 

include/scsi/scsi_device.h

@@ -79,9 +79,9 @@ struct scsi_device {
 	char inq_periph_qual;	/* PQ from INQUIRY data */	
 	unsigned char inquiry_len;	/* valid bytes in 'inquiry' */
 	unsigned char * inquiry;	/* INQUIRY response data */
-	char * vendor;		/* [back_compat] point into 'inquiry' ... */
-	char * model;		/* ... after scan; point to static string */
-	char * rev;		/* ... "nullnullnullnull" before scan */
+	const char * vendor;		/* [back_compat] point into 'inquiry' ... */
+	const char * model;		/* ... after scan; point to static string */
+	const char * rev;		/* ... "nullnullnullnull" before scan */
 	unsigned char current_tag;	/* current tag */
 	struct scsi_target      *sdev_target;   /* used only for single_lun */