libxtables: Replace direct exit_error() calls inside libxtables

Replace direct exit_error() calls inside libxtables with
xt_params->exit_error().

With this change; i can now compile the useless app:
-----
 #include <xtables.h>
 int main(int argc, char **argv) {

        return 0;
 }
----

with "gcc useless.c -lxtables -ldl"

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