fixed bug in mime message reset

+2002-12-02  Frederic Gobry  <frederic.gobry@smartdata.ch>
+
+	* mailbox/mime.c (_mime_body_read): reset the part offset when
+	resetting the message.
+
 2002-11-29  Sergey Poznyakoff 
 
 	* mailbox/date.c: New version of mu_tm2time function.

@@ -476,6 +476,8 @@ _mime_body_read(stream_t stream, char *buf, size_t buflen, off_t off, size_t *nb
 	if ( off == 0 ) { 			/* reset message */
 		mime->cur_offset = 0;
 		mime->cur_part = 0;
+		mime->part_offset = 0;
+
 		if ( mime->nmtp_parts > 1 )
 			mime->flags |= MIME_INSERT_BOUNDARY;
 	}