[PATCH] fix /proc/scsi/sg/devices when no SCSI devices

[Tony Battersby <tonyb@cybernetics.com>]

The patch "[SCSI] sg: use idr to replace static arrays" in 2.6.24-rc1
causes a bogus line to appear in /proc/scsi/sg/devices containing
"-1 -1 -1 -1 -1 -1 -1 -1 -1" when there are no SCSI devices in the
system.  In 2.6.23, /proc/scsi/sg/devices is empty when there are no
SCSI devices in the system.  A similar problem exists with
/proc/scsi/sg/device_strs.  The following patch restores the behavior
of 2.6.23.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
---
--- linux-2.6.24-rc8-git5/drivers/scsi/sg.c.orig	2008-01-22 15:08:46.000000000 -0500
+++ linux-2.6.24-rc8-git5/drivers/scsi/sg.c	2008-01-22 15:09:05.000000000 -0500
@@ -2521,7 +2521,7 @@ sg_idr_max_id(int id, void *p, void *dat
 static int
 sg_last_dev(void)
 {
-	int k = 0;
+	int k = -1;
 	unsigned long iflags;
 
 	read_lock_irqsave(&sg_index_lock, iflags);