Make dev_t 32-bits and provide backwards compatibility

nbsd_include/sys/ioc_net.h

@@ -77,6 +77,7 @@ struct msg_control
 #define NWIOSUDSCONN	_IOW ('n', 74, struct sockaddr_un) /* connect() */
 #define NWIOSUDSSHUT    _IOW ('n', 75, int)		  /* shutdown() */
 #define NWIOSUDSPAIR	_IOW ('n', 76, dev_t)		  /* socketpair() */
+#define NWIOSUDSPAIROLD	_IOW ('n', 76, short)		  /* socketpair() */
 #define NWIOSUDSACCEPT	_IOW ('n', 77, struct sockaddr_un) /* accept() */
 #define NWIOSUDSCTRL	_IOW ('n', 78, struct msg_control) /* sendmsg() */
 #define NWIOGUDSCTRL	_IORW('n', 79, struct msg_control) /* recvmsg() */

nbsd_include/sys/stat.h

@@ -42,13 +42,13 @@ struct stat {
 
 
 struct minix_prev_stat {
-  dev_t st_dev;			/* major/minor device number */
+  short st_dev;			/* major/minor device number */
   ino_t st_ino;			/* i-node number */
   mode_t st_mode;		/* file mode, protection bits, etc. */
   nlink_t st_nlink;		/* # links; */
   uid_t st_uid;			/* uid of the file's owner */
   short int st_gid;		/* gid; TEMPORARY HACK: should be gid_t */
-  dev_t st_rdev;
+  short st_rdev;
   off_t st_size;		/* file size */
   time_t st_atime;		/* time of last access */
   time_t st_mtime;		/* time of last data modification */

nbsd_include/sys/types.h

@@ -193,7 +193,7 @@ typedef	int64_t		daddr_t;	/* disk address */
 #endif
 
 
-typedef	short		dev_t;		/* device number */
+typedef	uint32_t	dev_t;		/* device number */
 typedef	uint32_t	fixpt_t;	/* fixed point number */
 
 #ifndef	gid_t