netlabel: fix an uninitialized warning in netlbl_unlabel_staticlist()

Static checking revealed that a previous fix to
netlbl_unlabel_staticlist() leaves a stack variable uninitialized,
this patches fixes that.

Fixes: 866358ec ("netlabel: fix our progress tracking in netlbl_unlabel_staticlist()")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Link: https://lore.kernel.org/r/160530304068.15651.18355773009751195447.stgit@siflSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/netlabel/netlabel_unlabeled.c

@@ -1167,7 +1167,7 @@ static int netlbl_unlabel_staticlist(struct sk_buff *skb,
 	u32 skip_bkt = cb->args[0];
 	u32 skip_chain = cb->args[1];
 	u32 skip_addr4 = cb->args[2];
-	u32 iter_bkt, iter_chain, iter_addr4 = 0, iter_addr6 = 0;
+	u32 iter_bkt, iter_chain = 0, iter_addr4 = 0, iter_addr6 = 0;
 	struct netlbl_unlhsh_iface *iface;
 	struct list_head *iter_list;
 	struct netlbl_af4list *addr4;