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urlencode: fix /fd/0 use

--- a/sys/src/cmd/urlencode.c

+++ b/sys/src/cmd/urlencode.c

@@ -44,9 +44,12 @@

 	} ARGEND;

 	if(argc == 1){

-		close(0);

-		if(open(*argv, OREAD) < 0)

+		int fd;

+

+		fd = open(*argv, OREAD);

+		if(fd < 0)

 			sysfatal("%r");

+		if(fd != 0) dup(fd, 0);

 	} else if(argc > 1)

 		usage();

-- 

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