erec: fix buffer overflow

erec: fix buffer overflow

A static array was used to read data and to write information in
it without checking the limit of the array. The result was a buffer
overflow when the line was longer than 1024.

This patch now uses a allocated buffer to avoid the problem.

Signed-off-by: Eric Leblond <eric@regit.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>