alloc_io() cannot fail, so stop checking the return value.
--- diff/drivers/md/dm.c	2003-01-10 11:49:27.000000000 +0000
+++ source/drivers/md/dm.c	2003-01-16 11:15:19.000000000 +0000
@@ -424,9 +424,6 @@
 	}
 
 	io = alloc_io(md);
-	if (!io)
-		return -ENOMEM;
-
 	down_read(&md->lock);
 
 	r = __deferring(md, rw, bh);