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games/c64: fix -2/-3

--- a/sys/src/games/c64/vic.c

+++ b/sys/src/games/c64/vic.c

@@ -9,7 +9,7 @@

 u16int vc, vcbase, vmli;

 u8int badln, rc, displ, fract, visreg, hbord, vbord, rbord0, lbord0;

 u16int chrp[40];

-u8int pic[400*300*3*3];

+u8int pic[420*263*4*3];

 u64int pxs, npxs, npxs0, opxs;

 u8int fg;

@@ -92,20 +92,24 @@

 void

 pixeldraw(u64int p, int n)

 {

-	int i;

+	int i, j;

 	static u8int cr[] = {0, 255, 136, 170, 204, 0, 0, 238, 221, 102, 255, 51, 119, 170, 0, 187};

 	static u8int cg[] = {0, 255, 0, 255, 68, 204, 0, 238, 136, 68, 119, 51, 119, 255, 136, 187};

 	static u8int cb[] = {0, 255, 0, 238, 204, 85, 170, 119, 85, 0, 119, 51, 119, 102, 255, 187};

 	u8int *q, c;

-	q = pic + picidx * 4;

+	q = pic + picidx * 4 * scale;

 	for(i = 0; i < n; i++){

 		c = p >> 56;

 		p <<= 8;

-		q[4 * i] = cb[c];

-		q[4 * i + 1] = cg[c];

-		q[4 * i + 2] = cr[c];

+		j = scale;

+		do{

+			*q++ = cb[c];

+			*q++ = cg[c];

+			*q++ = cr[c];

+			q++;

+		}while(--j);

 	}

 	picidx += n;

 }