[PATCH] IPMI: Fix oops on ipmi_msghandler removal for non ipmi systems

When the ipmi_si module is loaded on a system without any ipmi device, it
fails with nodev.  It would be fine if all resources were freed.  A call to
device_unregister() is missing, resulting to a oops when you remove the
ipmi_msghandler.
Signed-off-by: NArnaud Patard <apatard@mandriva.com>
Acked-by: NCorey Minyard <minyard@acm.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/char/ipmi/ipmi_si_intf.c

@@ -2481,6 +2481,7 @@ static __devinit int init_ipmi_si(void)
 #ifdef CONFIG_PCI
 		pci_unregister_driver(&ipmi_pci_driver);
 #endif
+		driver_unregister(&ipmi_driver);
 		printk("ipmi_si: Unable to find any System Interface(s)\n");
 		return -ENODEV;
 	} else {