Don't allocate more space than necessary for a sip_pkt

This extra allocation is a hold-over from when pkt->data was a 
character array. Now that it is an allocated string, just allocate 
enough for the sip_pkt.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@314549 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -3938,7 +3938,7 @@ static enum sip_result __sip_reliable_xmit(struct sip_pvt *p, int seqno, int res
 		}
 	}
 
-	if (!(pkt = ast_calloc(1, sizeof(*pkt) + len + 1)))
+	if (!(pkt = ast_calloc(1, sizeof(*pkt))))
 		return AST_FAILURE;
 	/* copy data, add a terminator and save length */
 	if (!(pkt->data = ast_str_create(len))) {