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Convert second expression of for(;;) in a condition

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -91,7 +91,7 @@

 	expect('(');

 	einit = (yytoken != ';') ? expr() : NULL;

 	expect(';');

-	econd = (yytoken != ';') ? expr() : NULL;

+	econd = (yytoken != ';') ? condition() : NULL;

 	expect(';');

 	einc = (yytoken != ')') ? expr() : NULL;

 	expect(')');