[SCSI] scsi_dh: Use scsi_devinfo functions to do matching of device_handler tables.

Previously we were using strncmp in order to avoid having to include
whitespace in the devlist, but this means "HSV1000" matches a device
list entry that says "HSV100", which is wrong.  This patch changes
scsi_dh.c to use scsi_devinfo's matching functions instead, since they
handle these cases correctly.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>

include/scsi/scsi_device.h

@@ -184,6 +184,7 @@ typedef void (*activate_complete)(void *, int);
 struct scsi_device_handler {
 	/* Used by the infrastructure */
 	struct list_head list; /* list of scsi_device_handlers */
+	int idx;
 
 	/* Filled by the hardware handler */
 	struct module *module;