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auth/asm12dsa: use fd 0 instead of trying to open /dev/stdin (thanks arpunk)

--- a/sys/src/cmd/auth/asn12dsa.c

+++ b/sys/src/cmd/auth/asn12dsa.c

@@ -18,7 +18,7 @@

 	uchar *buf;

 	int fd;

 	long n, tot;

-	char *tag, *file;

+	char *tag;

 	DSApriv *key;

 	fmtinstall('B', mpfmt);

@@ -35,13 +35,12 @@

 	if(argc != 0 && argc != 1)

 		usage();

-	if(argc == 1)

-		file = argv[0];

-	else

-		file = "/dev/stdin";

+	fd = 0;

+	if(argc == 1){

+		if((fd = open(*argv, OREAD)) < 0)

+			sysfatal("open %s: %r", *argv);

+	}

-	if((fd = open(file, OREAD)) < 0)

-		sysfatal("open %s: %r", file);

 	buf = nil;

 	tot = 0;

 	for(;;){

-- 

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