code: 9ferno

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avoid panic when closing an empty channel

--- a/os/port/chan.c

+++ b/os/port/chan.c

@@ -512,7 +512,9 @@

 void

 cclose(Chan *c)

 {

-	if(c == nil || c->ref < 1 || c->flag&CFREE)

+	if(c == nil)

+		return;

+	if(c->ref < 1 || c->flag&CFREE)

 		panic("cclose %#p", getcallerpc(&c));

 	if(decref(c))