Revert "net/sched: act_connmark: handle errno on tcf_idr_check_alloc"

This reverts commit 652b24f07bae56e3e690b7f6516c238481376b59 which is
commit fb07390463c95e6eef254044d6dde050bfb9807a upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I721e2f4251051d550a3c22ce2171b5fb886e4b65
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

net/sched/act_connmark.c

diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index 505f9cf..0deb4e9 100644
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -160,9 +160,6 @@ static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 		if (goto_ch)
 			tcf_chain_put_by_act(goto_ch);
 		ret = 0;
-	} else {
-		err = ret;
-		goto out_free;
 	}
 
 	return ret;