End transfers with MLT for Ultrix netload.

Ultrix 4.00 netload requires transfers to end with Memory Load
with Transfer Address. The load address must be present, though
image data doesn't have to be present.

common/common.h

@@ -84,6 +84,7 @@ struct dllist {
 	u_int32_t	xferaddr;	/* Transfer Address		*/
 	u_int32_t	nloadaddr;	/* Next Load Address		*/
 	off_t		lseek;		/* Seek before last read	*/
+	int		endcode;	/* MOP command to end with	*/
 	mopd_imagetype	image_type;	/* what type of image is it?	*/
 
 	/* For Elf32 files */