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devaudio: ignore non absolute volume items with range 0

--- a/sys/src/9/port/devaudio.c

+++ b/sys/src/9/port/devaudio.c

@@ -363,6 +363,8 @@

 		if(vol[i].type == Absolute)

 			p += snprint(p, e - p, "%s %d\n", vol[i].name, v[0]);

 		else {

+			if(vol[i].range == 0)

+				continue;

 			for(j=0; j<2; j++){

 				if(v[j] < 0)

 					v[j] = 0;