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games/snes: fix dspclock signed overflow (music stoping for minute)

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

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

@@ -284,11 +284,11 @@

 		}

 		while(spcclock < 0)

 			spcclock += spcstep() * SPCDIV;

-		if(stimerclock >= SPCDIV*16){

+		while(stimerclock >= SPCDIV*16){

 			spctimerstep();

 			stimerclock -= SPCDIV*16;

 		}

-		if(dspclock >= SPCDIV){

+		while(dspclock >= SPCDIV){

 			dspstep();

 			dspclock -= SPCDIV;

 		}