Declarator::clear(): Null out variable after it's been deleted.

This avoids a double free (which is good:-)

Bug submitted by Eli.

llvm-svn: 46105

Author: Steve Naroff

clang/include/clang/Parse/DeclSpec.h

@@ -566,6 +566,7 @@ class Declarator {
     }
     DeclTypeInfo.clear();
     delete AttrList;
+    AttrList = 0;
   }
 
   /// mayOmitIdentifier - Return true if the identifier is either optional or

clang/test/Sema/declspec.c

@@ -3,3 +3,6 @@ typedef char T[4];
 
 T foo(int n, int m) {  }  // expected-error {{cannot return array or function}}
 
+void foof(const char *, ...) __attribute__((__format__(__printf__, 1, 2))), barf (void);
+
+