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Fix cast()

lp was not initialized in any place.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -694,7 +694,8 @@

 			error("cast specify a function type");

 		default:

 			expect(')');

-			if ((rp = convert(cast(),  tp, 1)) == NULL)

+			lp = cast();

+			if ((rp = convert(lp,  tp, 1)) == NULL)

 				error("bad type convertion requested");

 			rp->lvalue = lp->lvalue;

 		}