[PATCH] minor fix to sym2 hotplug conversion

One problem we found when we hit a bad adapter, we need to use scsi_host_put.

drivers/scsi/sym53c8xx_2/sym_glue.c

@@ -2029,7 +2029,7 @@ sym_attach (struct scsi_host_template *tpnt, int unit, sym_device *dev)
 	printf_info("%s: giving up ...\n", sym_name(np));
 	if (np)
 		sym_free_resources(np);
-	scsi_unregister(instance);
+	scsi_host_put(instance);
 
         return -1;
  }