[PATCH] USB storage: fix sign bug in usb-storage datafab

2.6 has no -fsigned-char anymore. there are 3 checks for info->lun < 0

drivers/usb/storage/datafab.h

@@ -29,7 +29,7 @@ extern int datafab_transport(Scsi_Cmnd *srb, struct us_data *us);
 struct datafab_info {
 	unsigned long   sectors;	// total sector count
 	unsigned long   ssize;		// sector size in bytes
-	char		lun;		// used for dual-slot readers
+	signed char	lun;		// used for dual-slot readers
 	
 	// the following aren't used yet
 	unsigned char   sense_key;