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lib9p: fix listensrv() filedescriptor leaks

--- a/sys/src/lib9p/listen.c

+++ b/sys/src/lib9p/listen.c

@@ -44,11 +44,13 @@

 			break;

 		}

-		data = accept(ctl, ndir);

+		data = accept(nctl, ndir);

 		if(data < 0){

 			fprint(2, "%s: accept %s: %r\n", argv0, ndir);

+			close(nctl);

 			continue;

 		}

+		close(nctl);

 		s = emalloc9p(sizeof *s);

 		*s = *os;