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games/snes: small hdma fix

--- a/sys/src/games/snes/mem.c

+++ b/sys/src/games/snes/mem.c

@@ -486,7 +486,7 @@

 {

 	int i, j, cyc;

 	u8int *p, *q, n, m, b, v, c;

-	u32int a;

+	u32int a, br;

 	cyc = 0;

 	if(dma != 0)

@@ -502,12 +502,15 @@

 		if((hdma & (1<<(16+i))) != 0){

 			n = nbytes[c & 7];

 			m = modes[c & 7];

-			if((c & 0x40) != 0)

+			if((c & 0x40) != 0){

 				q = p + 5;

-			else

+				br = p[7] << 16;

+			}else{

 				q = p + 8;

+				br = p[4] << 16;

+			}

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

-				a = q[0] | q[1] << 8 | p[4] << 16;

+				a = q[0] | q[1] << 8 | br;

 				b = p[1] + (m & 3);

 				if((c & 0x80) != 0){

 					v = dmavalid(b, 1) ? memread(0x2100 | b) : 0;