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Remove unneeded variable in addmacro()

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -30,12 +30,10 @@

 {

 	char *p, *q;

 	Symbol *sym;

-	size_t len;

 	if ((p = strchr(s, '=')) != NULL) {

 		*p++='\0';

-		len = strlen(p);

-		q = xmalloc(len+4);

+		q = xmalloc(strlen(p) + 4);

 		sprintf(q, "-1#%s", p);

 		p = q;

 	}