iptables-compat: homogenize error messages with 'R' option

There is a difference between error messages in iptables and
iptables-compat:

 # iptables -R INPUT 23 -s 192.168.2.140 -j ACCEPT
iptables: Index of replacement too big.
 # iptables-compat -R INPUT 23 -s 192.168.2.140 -j ACCEPT
iptables: No chain/target/match by that name.

Now, iptables-compat shows the same error message than iptables in
this case.

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_TEE: Trim kernel struct to allow deletion

Correct trimming of userspacesize to fix deletions.

Fixes: Bugzilla #884.

The rule having TEE target with '--oif' option cannot be deleted by iptables command.

  $ iptables -I INPUT -i foo -j TEE --gateway x.x.x.x --oif bar
  $ iptables -D INPUT -i foo -j TEE --gateway x.x.x.x --oif bar
  iptables: No chain/target/match by that name.

Signed-off-by: Loganaden Velvindron <logan@elandsys.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>