ieee1394: sbp2: fix sbp2_remove_device for error cases

Bug found by Olaf Hering <olh@suse.de>:
sbp2util_remove_command_orb_pool requires a valid lu->hi pointer.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/sbp2.c

@@ -513,9 +513,9 @@ static int sbp2util_create_command_orb_pool(struct sbp2_lu *lu)
 	return 0;
 }
 
-static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu)
+static void sbp2util_remove_command_orb_pool(struct sbp2_lu *lu,
+					     struct hpsb_host *host)
 {
-	struct hpsb_host *host = lu->hi->host;
 	struct list_head *lh, *next;
 	struct sbp2_command_info *cmd;
 	unsigned long flags;
@@ -922,15 +922,16 @@ static void sbp2_remove_device(struct sbp2_lu *lu)
 
 	if (!lu)
 		return;
-
 	hi = lu->hi;
+	if (!hi)
+		goto no_hi;
 
 	if (lu->shost) {
 		scsi_remove_host(lu->shost);
 		scsi_host_put(lu->shost);
 	}
 	flush_scheduled_work();
-	sbp2util_remove_command_orb_pool(lu);
+	sbp2util_remove_command_orb_pool(lu, hi->host);
 
 	list_del(&lu->lu_list);
 
@@ -971,9 +972,8 @@ static void sbp2_remove_device(struct sbp2_lu *lu)
 
 	lu->ud->device.driver_data = NULL;
 
-	if (hi)
-		module_put(hi->host->driver->owner);
-
+	module_put(hi->host->driver->owner);
+no_hi:
 	kfree(lu);
 }