Add comments with warnings obtained on NetBSD/i386.  Both are due to
size_t being used for streams.  Perhaps cast to unsigned long before
printf?  Surely that's big enough even if size_t could be larger in
theory.

(no changelog, since only comment changes)
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 44c8585..8ffcfdd 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -1166,6 +1166,7 @@
       /* Check remaining length check.*/
       if (endp - BGP_INPUT_PNT (peer) < BGP_ATTR_MIN_LEN)
 	{
+	  /* XXX warning: long int format, int arg (arg 5) */
 	  zlog (peer->log, LOG_WARNING, 
 		"%s error BGP attribute length %ld is smaller than min len",
 		peer->host, endp - STREAM_PNT (BGP_INPUT (peer)));