added Handle:=nil to .release method

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@728 8e941d3f-bd1b-0410-a28a-d453659cc2b4

bindings/pascocoa/foundation/NSObject.inc

@@ -302,6 +302,7 @@ end;
 procedure NSObject.release;
 begin
   objc_msgSend(Handle, sel_registerName(PChar(Str_release)), []);
+  Handle:=nil;
 end;
 
 function NSObject.autorelease: objc.id;