ACPI: ipmi: Remove address space handler in error path

The acpi_install_address_space_handler() is coupled with
acpi_remove_address_space_handler() in ipmi module init/exit, but
it forgets to remove the handler in acpi_ipmi_init() if the
ipmi_smi_watcher_register() call fails, so add the removal of the
address space handler in error path.

Signed-off-by: Hanjun Guo <[e-mail]>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/acpi_ipmi.c

···
 		pr_warn("Can't register IPMI opregion space handle\n");
 		return -EINVAL;
 	}
+
 	result = ipmi_smi_watcher_register(&driver_data.bmc_events);
-	if (result)
+	if (result) {
+		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
+										  ACPI_ADR_SPACE_IPMI,
+										  &acpi_ipmi_space_handler);
 		pr_err("Can't register IPMI system interface watcher\n");
+	}
 
 	return result;
 }