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games/nes: minor ppu improvements

--- a/sys/src/games/nes/ppu.c

+++ b/sys/src/games/nes/ppu.c

@@ -109,13 +109,14 @@

 	static int t;

 	u8int c, a;

 	static u8int nr1, nr2, na;

-	static u32int r1, r2, a1, a2;

+	static u16int r1, r2, a1, a2;

 	if(ppux >= 2 && ppux <= 257 || ppux >= 322 && ppux <= 337){

 		c = (r1 >> (15-ppusx)) & 1 | (r2 >> (14-ppusx)) & 2;

-		a = (a1 >> (15-ppusx)) & 1 | (a2 >> (14-ppusx)) & 2;

-		if(ppuy < 240 && ppux <= 257)

+		if(ppuy < 240 && ppux <= 257){

+			a = (a1 >> (15-ppusx)) & 1 | (a2 >> (14-ppusx)) & 2;

 			pixel(ppux-2, ppuy, pal(c, a, 0), c == 0);

+		}

 		r1 <<= 1;

 		r2 <<= 1;

 		a1 <<= 1;