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eui: get rid of useless and uninformative n-1 read size

--- a/sys/src/games/eui.c

+++ b/sys/src/games/eui.c

@@ -61,8 +61,7 @@

 static void

 joyproc(void *)

 {

-	char *s, *down[9];

-	static char buf[64];

+	char buf[64], *s, *down[9];

 	int n, k, j;

 	Kfn *kp;

@@ -69,7 +68,7 @@

 	j = 1;

 	for(;;){

-		n = read(0, buf, sizeof(buf) - 1);

+		n = read(0, buf, sizeof(buf));

 		if(n <= 0)

 			sysfatal("read: %r");

 		buf[n-1] = 0;

-- 

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