appletalk: fix a coccinella warning in net/appletalk/ddp.c

This warning is introduced by commit 7b30600cc6 ("appletalk:
fix checkpatch error with indent"), So fix it.

Signed-off-by: Wang Weidong <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 01a1082..8ceabc0 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1808,7 +1808,7 @@
 		long amount = 0;
 
 		if (skb)
-		amount = skb->len - sizeof(struct ddpehdr);
+			amount = skb->len - sizeof(struct ddpehdr);
 		rc = put_user(amount, (int __user *)argp);
 		break;
 	}