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cc1: Remove unused variable in expandarg()

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -181,7 +181,7 @@

 static int

 expandarg(char *arg, char *buf, int bufsiz)

 {

-	int siz, n;

+	int siz;

 	char *s = buf;

 	addinput(IPARAM, arg, FAIL);