Explicitly initialize bio lists.

Currently, zeroing the list with kzalloc already does the initialization,
bit if we ever switch to another bio list implementation, it could be a problem.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm-raid1.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.31-rc2-devel/drivers/md/dm-raid1.c
===================================================================
--- linux-2.6.31-rc2-devel.orig/drivers/md/dm-raid1.c	2009-07-13 15:47:31.000000000 +0200
+++ linux-2.6.31-rc2-devel/drivers/md/dm-raid1.c	2009-07-13 15:48:08.000000000 +0200
@@ -778,6 +778,9 @@ static struct mirror_set *alloc_context(
 	}
 
 	spin_lock_init(&ms->lock);
+	bio_list_init(&ms->reads);
+	bio_list_init(&ms->writes);
+	bio_list_init(&ms->failures);
 
 	ms->ti = ti;
 	ms->nr_mirrors = nr_mirrors;