ipmi:ipmb: Don't call ipmi_unregister_smi() on a register failure

The data structure won't be set up to be unregistered, and it can result in
crashes if the register fails.
Signed-off-by: Corey Minyard <minyard@acm.org>

drivers/char/ipmi/ipmi_ipmb.c

@@ -424,10 +424,8 @@ static void ipmi_ipmb_request_events(void *send_info)
 	/* We don't fetch events here. */
 }
 
-static int ipmi_ipmb_remove(struct i2c_client *client)
+static void ipmi_ipmb_cleanup(struct ipmi_ipmb_dev *iidev)
 {
-	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
-
 	if (iidev->slave) {
 		i2c_slave_unregister(iidev->slave);
 		if (iidev->slave != iidev->client)
@@ -436,7 +434,13 @@ static int ipmi_ipmb_remove(struct i2c_client *client)
 	iidev->slave = NULL;
 	iidev->client = NULL;
 	ipmi_ipmb_stop_thread(iidev);
+}
+
+static int ipmi_ipmb_remove(struct i2c_client *client)
+{
+	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
 
+	ipmi_ipmb_cleanup(iidev);
 	ipmi_unregister_smi(iidev->intf);
 
 	return 0;
@@ -544,7 +548,7 @@ static int ipmi_ipmb_probe(struct i2c_client *client)
 out_err:
 	if (slave && slave != client)
 		i2c_unregister_device(slave);
-	ipmi_ipmb_remove(client);
+	ipmi_ipmb_cleanup(iidev);
 	return rv;
 }