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kernel: delcare nalemenerror() and faulterror() as _Noreturn

--- a/sys/src/9/port/chan.c

+++ b/sys/src/9/port/chan.c

@@ -1202,7 +1202,7 @@

 	}

 }

-void

+_Noreturn void

 namelenerror(char *aname, int len, char *err)

 {

 	char *ename, *name, *next;

--- a/sys/src/9/port/fault.c

+++ b/sys/src/9/port/fault.c

@@ -5,7 +5,7 @@

 #include	"fns.h"

 #include	"../port/error.h"

-static void

+_Noreturn static void

 faulterror(char *s, Chan *c)

 {

 	char buf[ERRMAX];

--- a/sys/src/9/port/portfns.h

+++ b/sys/src/9/port/portfns.h

@@ -206,7 +206,7 @@

 void		mul64fract(uvlong*, uvlong, uvlong);

 void		muxclose(Mnt*);

 Chan*		namec(char*, int, int, ulong);

-void		namelenerror(char*, int, char*);

+_Noreturn void	namelenerror(char*, int, char*);

 int		needpages(void*);

 Chan*		newchan(void);

 int		newfd(Chan*, int);

-- 

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