Add missing dm-zero version number.

--- diff/drivers/md/dm-zero.c	2004-06-11 19:22:02.000000000 +0100
+++ source/drivers/md/dm-zero.c	2004-06-11 19:30:00.000000000 +0100
@@ -66,6 +66,7 @@
 
 static struct target_type zero_target = {
 	.name   = "zero",
+	.version = {1, 0, 0},
 	.module = THIS_MODULE,
 	.ctr    = zero_ctr,
 	.map    = zero_map,