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sed: remove unused ecmp function

--- a/sys/src/cmd/sed.c

+++ b/sys/src/cmd/sed.c

@@ -177,7 +177,6 @@

 Rune	*compsub(Rune *, Rune *);

 void	dechain(void);

 void	dosub(Rune *);

-int	ecmp(Rune *, Rune *, int);

 void	enroll(char *);

 void	errexit(void);

 int	executable(SedCom *);

@@ -1323,13 +1322,6 @@

 	while (n--)

 		Bputrune(bp, *buf++);

 	Bputc(bp, '\n');

-}

-ecmp(Rune *a, Rune *b, int count)

-{

-	while(count--)

-		if(*a++ != *b++)

-			return 0;

-	return 1;

 }

 void