Remove stray semicolon.

I've found the most severe bug report ever! ;-)

You got a stray semicolon in dm.c, around :809
+       atomic_inc(&md->event_nr);;

Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
From: Lars Marowsky-Bree <lmb@suse.de>
--- diff/drivers/md/dm.c	2004-10-19 16:56:08.000000000 +0100
+++ source/drivers/md/dm.c	2004-10-19 16:55:56.000000000 +0100
@@ -808,7 +808,7 @@
 {
 	struct mapped_device *md = (struct mapped_device *) context;
 
-	atomic_inc(&md->event_nr);;
+	atomic_inc(&md->event_nr);
 	wake_up(&md->eventq);
 }