libspamc.c:message_filter() returns the wrong error code if try_to_connect_tcp()
or try_to_connect_unix() return an error.  Rather than return the error code
indicated by those functions' return values, i is returned.  As i will always be
2 at that point in the code, it's a less useful value from a diagnostic
perspective.  

The diff below, which is written against today's CVS snapshot oflibspamc.c,
fixes the problem.

1023c1023
<         return i;
---
>         return rc;