Tweak an expected-error to match the output. IMHO it is better to diagnose 'int (void)' because it has the same meaning in C and C++.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57901 91177308-0d34-0410-b5e6-96231b3b80d8

test/SemaCXX/decl-expr-ambiguity.cpp

@@ -19,7 +19,7 @@ void f() {
   (int(1)); // expected-warning {{expression result unused}}
 
   // type-id
-  (int())1; // expected-error {{used type 'int ()' where arithmetic or pointer type is required}}
+  (int())1; // expected-error {{used type 'int (void)' where arithmetic or pointer type is required}}
 
   // Declarations.
   int fd(T(a)); // expected-warning {{parentheses were disambiguated as a function declarator}}