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winwatch: show windows with empty labels (thanks jpm)

--- a/sys/src/cmd/winwatch.c

+++ b/sys/src/cmd/winwatch.c

@@ -117,7 +117,7 @@

 			n = atoi(pd[i].name);

 			if(n == mywinid)

 				continue;

-			if(readfile(label, sizeof(label), "/dev/wsys/%d/label", n) <= 0)

+			if(readfile(label, sizeof(label), "/dev/wsys/%d/label", n) < 0)

 				continue;

 			if(exclude != nil && regexec(exclude,label,nil,0))

 				continue;