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zuke: do not change volume with delta == 0

--- a/sys/src/cmd/audio/zuke/zuke.c

+++ b/sys/src/cmd/audio/zuke/zuke.c

@@ -148,6 +148,8 @@

 				a[1] = a[0];

 			l = ol = atoi(a[0]);

 			r = or = atoi(a[1]);

+			if(d == 0)

+				break;

 			for(;;){

 				l += d;

 				r += d;