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games/mix: remove unused variable

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

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

@@ -324,7 +324,6 @@

 yylex(void)

 {

 	static Rune buf[11];

-	static int bol;

 	Rune r, *bp, *ep;

 	static char cbuf[100];

 	int isnum;

@@ -349,12 +348,10 @@

 	case '(':

 	case ')':

 	case '=':

-		bol = 0;

 		return r;

 	case '/':

 		r = getr();

 		if(r == '/') {

-			bol = 0;

 			return LSS;

 		} else

 			Bungetrune(&bin);