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games/gb: fix bug that prevented timer data from being accessed (thanks qwx)

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

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

@@ -384,7 +384,7 @@

 		b0 %= nrom >> 14;

 		romb = rom + (b0 << 14);

 		return 0;

-	case 2: b1 = v & 15; b1 %= nbackbank; break;

+	case 2: b1 = v & 15; break;

 	case 3:

 		if(latch == 0 && v == 1){

 			timerl = timer;

@@ -404,7 +404,7 @@

 		}

 		return 0;

 	}

-	eramb = ramen && b1 < 4 ? back + (b1 << 13) : nil;

+	eramb = ramen && b1 < nbackbank ? back + (b1 << 13) : nil;

 	return 0;

 }