[patch] minimal ACPI bugfix

[Wolly]

"Avoid creating multiple /proc entries when (buggy) ACPI
BIOS tables erroneously list both fixed- and generic-
feature buttons."
While the function already prints a disgnostic message 
on this and registers the new button dir in /proc, it fails to 
remove the old one. 

This is a trivial patch which actually does that. 
ACPI maintainer Andy, please approve that. 

Regards,
Wolly

Patch is against 2.4.18 kernel;
patched file sm_osl.c is in drivers/acpi/ospm/button/

---------------------------<patch>---------------------------
diff -u bn_osl.c bn_osl.c-patched 
--- bn_osl.c	Mon Mar 11 14:06:56 2002
+++ bn_osl.c-patched	Mon Mar 11 14:02:27 2002
@@ -96,6 +96,7 @@
 			break;
 		case BN_TYPE_FIXED:
 			printk(KERN_WARNING "ACPI: Multiple power buttons detected, ignoring fixed-feature\n");
+			remove_proc_entry(BN_PROC_POWER_BUTTON, bn_proc_root);
 		default:
 			printk(KERN_INFO "ACPI: Power Button (CM) found\n");
 			bn_power_button = BN_TYPE_GENERIC;