serialization: check stream good flag at the end

just in case

src/cryptonote_basic/cryptonote_basic.h

@@ -320,7 +320,7 @@ namespace cryptonote
       }
       if (!typename Archive<W>::is_saving())
         pruned = true;
-      return true;
+      return ar.stream().good();
     }
 
   private:

src/ringct/rctTypes.h

@@ -256,7 +256,7 @@ namespace rct {
         {
           FIELD(type)
           if (type == RCTTypeNull)
-            return true;
+            return ar.stream().good();
           if (type != RCTTypeFull && type != RCTTypeSimple && type != RCTTypeBulletproof && type != RCTTypeBulletproof2 && type != RCTTypeFullBulletproof && type != RCTTypeSimpleBulletproof)
             return false;
           VARINT_FIELD(txnFee)
@@ -316,7 +316,7 @@ namespace rct {
               ar.delimit_array();
           }
           ar.end_array();
-          return true;
+          return ar.stream().good();
         }
     };
     struct rctSigPrunable {
@@ -329,7 +329,7 @@ namespace rct {
         bool serialize_rctsig_prunable(Archive<W> &ar, uint8_t type, size_t inputs, size_t outputs, size_t mixin)
         {
           if (type == RCTTypeNull)
-            return true;
+            return ar.stream().good();
           if (type != RCTTypeFull && type != RCTTypeSimple && type != RCTTypeBulletproof && type != RCTTypeBulletproof2 && type != RCTTypeFullBulletproof && type != RCTTypeSimpleBulletproof)
             return false;
           if (type == RCTTypeSimpleBulletproof || type == RCTTypeFullBulletproof)
@@ -448,7 +448,7 @@ namespace rct {
             }
             ar.end_array();
           }
-          return true;
+          return ar.stream().good();
         }
 
     };

src/serialization/serialization.h

@@ -212,7 +212,7 @@ inline bool do_serialize(Archive &ar, bool &v)
  * \brief self-explanatory
  */
 #define END_SERIALIZE()				\
-  return true;					\
+  return ar.stream().good();			\
   }
 
 /*! \macro VALUE(f)