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[ar] Remove unneded variable

--- a/src/cmd/ar.c

+++ b/src/cmd/ar.c

@@ -110,7 +110,6 @@

 archive(char *pname, FILE *to, char letter)

 {

 	int c;

-	size_t n;

 	FILE *from;

 	char mtime[13], *fname;

 	struct fprop prop;

@@ -133,9 +132,10 @@

 	        prop.gid,

 	        prop.mode,

 	        prop.size);

-	for (n = 0; (c = getc(from)) != EOF; n++)

+

+	while ((c = getc(from)) != EOF)

 		putc(c, to);

-	if (n & 1)

+	if (prop.size & 1)

 		putc('\n', to);

 	if (ferror(from))

 		error("reading input '%s': %s", pname, errstr());