lib: add stream_set_endp()

  * lib/stream.[ch]:

    - Add stream_set_endp(). This can be used to trim data (for
      example, padding) at the end of a stream.

    - Fix swapped 'getp' and 'endp' parameters in STREAM_WARN_OFFSETS.

From: Subbaiah Venkata <svenkata@google.com>
Signed-off-by: Avneesh Sachdev <avneesh@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@diac24.net>
diff --git a/lib/stream.h b/lib/stream.h
index 3e4ba7b..f10aa6d 100644
--- a/lib/stream.h
+++ b/lib/stream.h
@@ -146,6 +146,7 @@
 extern u_char *stream_get_data (struct stream *);
 
 extern void stream_set_getp (struct stream *, size_t);
+extern void stream_set_endp (struct stream *, size_t);
 extern void stream_forward_getp (struct stream *, size_t);
 extern void stream_forward_endp (struct stream *, size_t);