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nusb/ether: call sysfatal if dev is nil

--- a/sys/src/cmd/nusb/ether/ether.c

+++ b/sys/src/cmd/nusb/ether/ether.c

@@ -810,8 +810,9 @@

 	if(argc != 1)

 		usage();

-	d = getdev(atoi(*argv));

-	if(findendpoints(d, &ei, &eo)  < 0)

+	if((d = getdev(atoi(*argv))) == nil)

+		sysfatal("getdev: %r");

+	if(findendpoints(d, &ei, &eo) < 0)

 		sysfatal("no endpoints found");

 	werrstr("");