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nusb/audio: don't add a control if getvalues errored

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

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

@@ -489,7 +489,8 @@

 					c->cs = cs;

 					c->cn = cn;

 					c->id = b[1];

-					getvalues(c);

+					if(getvalues(c) != 0)

+						nctrl--;

 				}

 			}

 			break;

@@ -532,7 +533,8 @@

 					c->cs = cs;

 					c->cn = cn;

 					c->id = b[1];

-					getvalues(c);

+					if(getvalues(c) != 0)

+						nctrl--;

 				}

 			}

 			break;

-- 

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