AUTOSENSE bug in NCR5380.c

From: 	Kenn Humborg <kenn@linux.ie>

round line 2470 in NCR5380.c, if a command fails, and AUTOSENSE is on,
the current command is converted into a REQUEST_SENSE command and
put at the top of the request queue.  Part of this setup, is setting
up cmd->SCp to point at the sense_buffer, so that the received sense
data goes straight into the sense buffer.

Around line 1730, NCR5380_select() calls initialize_SCp() which ends
up clobbering cmd->SCp, and the sense data get written into the 
original request buffer.

This is what happens if cmd->use_sg = 0.  I haven't looked at what
happens if use_sg is non-zero, but I expect the effect will be the same.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/NCR5380.c

@@ -1720,8 +1720,9 @@ static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag)
 	hostdata->connected = cmd;
 	hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
 
-	initialize_SCp(cmd);
-
+	if (cmd->SCp.ptr != (char *)cmd->sense_buffer) {
+		initialize_SCp(cmd);
+	}
 
 	return 0;