libxtables: simple aliasing macro for exit_error

Rename xtables_globals exit_error cb to exit_err and introduce
a very simple aliasing macro to point to it.
convert iptables, ip6tables and iptables_xml to use it.
Note iptables_xml does not have to define its own exit_error()
since it can use the basic one provided.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Patrick McHardy <kaber@trash.net>
5 files changed