Revert "fix "no viable conversion from ... to 'bool'""

This reverts commit df9ae3ab9b37fde803f26c6bc4eaadfd67fc1d07.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/post.h b/src/post.h
index c4fc3827..c2f77b32 100644
--- a/src/post.h
+++ b/src/post.h
@@ -205,7 +205,7 @@ public:
   mutable optional<xdata_t> xdata_;
 
   bool has_xdata() const {
-    return xdata_ != NULL;
+    return xdata_;
   }
   void clear_xdata() {
     xdata_ = none;