shithub: riscv

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rio: fix crash when walking windowless fid (thanks ilikebreadtoomuch)

--- a/sys/src/cmd/rio/fsys.c

+++ b/sys/src/cmd/rio/fsys.c

@@ -417,7 +417,8 @@

 				type = QTDIR;

 				qunlock(&all);

 				incref(w);

-				sendp(winclosechan, f->w);

+				if(f->w)

+					sendp(winclosechan, f->w);

 				f->w = w;

 				dir = dirtab;

 				goto Accept;