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games/snes: minor cpu bug fix

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

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

@@ -756,7 +756,7 @@

 			rA--;

 		nz(rA);

 		return 2;

-	case 0x3B: nz(rA = rS); return 2;

+	case 0x3B: nz16(rA = rS); return 2;

 	case 0x3C: bit(mem816(abso(0, 1), 0)); return 4+cyc;

 	case 0x3D: nz(rA &= mem816(abso(0, 1), 0xFF00)); return 4+cyc;

 	case 0x3E: rol(abso(0, 1)); return 7+cyc;