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cat: remove stupid long cast

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

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

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

 	char buf[8192];

 	long n;

-	while((n=read(f, buf, (long)sizeof buf))>0)

+	while((n=read(f, buf, sizeof buf))>0)

 		if(write(1, buf, n)!=n)

 			sysfatal("write error copying %s: %r", s);

 	if(n < 0)