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libventi: handle nil connection in rpc as error instead of crashing (from sources)

--- a/sys/src/libventi/rpc.c

+++ b/sys/src/libventi/rpc.c

@@ -37,6 +37,13 @@

 	uchar tag, buf[2], *top;

 	Rwait *r, *rr;

+ 

+	if(z == nil){

+		werrstr("not connected");

+		packetfree(p);

+		return nil;

+	}

+

 	/* must malloc because stack could be private */

 	r = vtmallocz(sizeof(Rwait));

-- 

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